Most people start with engine performance, and they usually concentrate on the simple idea that improving the flow of air into the engine and exhaust out of the engine and improving the flow out of the engine will allow the engine to work with greater ease. The less work the engine must do pulling air in and pushing exhaust out, the more energy is left over for more important things, like pushing the car across the pavement more quickly. This is the reason that intake and exhaust upgrades are so popular, typically consisting of:

• Isuzuperformance cold air intake system.
• Isuzuperformance 2 1/2 inch cat back exhaust system.
• Isuzuperformance Tri-Y header.
• Isuzuperformance high flow catalytic converter.

Reducing the amount of weight of the parts the engine has to turn around in circles is always a good way to free up power. To parallel the first example, the less energy the engine must expend to spin its parts, the more energy it can apply to those more important things like moving from place to place more quickly. There are some bolt on parts that are popular bolt ons are typically:

• Isuzuperformance underdrive pulley set (crank, power steering, alternator.
• Isuzuperformance aluminum flywheel.

Once the basics are covered, the usual choice is to work on the performance of related systems to improve flow through the engine, spark, and how the vehicle transfers that power to the ground.
Spark:

• Torquemaster plugs.
• Upgrade spark plug wires.
• Accel 300+ ignition system.

• RC Engineering Heavy Breather throttlebody porting.
• Web Cam camshaft regrind.
• Extrudehone upper and lower intake manifold.

• Isuzuperformance clutch.
• Isuzuperformance limited slip differential.
• Isuzuperformance coilovers.

• Isuzuperformance sway bars.
• Isuzuperformance strut braces.
• Brembo brake rotors and Carbotech pads.
• Isuzuperformance stainless steel brake hoses.

The Sports Car Club of America divides cars into different classes based on the level of preparation (modification) to the car above the level of stock, as well as the relative performance level of the car itself. This is to equalize competition and make racing a contest of driver ability, not who can build the fastest car on corners and straightaways.
Autocrossing itself involves racing a car around a tight course of orange cones against the clock. Speeds rarely exceed 60 MPH, and the ability of the driver to manuever the car is the primary issue, followed by the cars ability to corner, and raw horsepower or straight line acceleration ability falls far back in importance behind these two.
Of primary importance when looking into car preparation is to obtain a current copy of the rules and follow the rules to make only modifications to the car which will allow the car to remain in the desired class of competition. The rules are very stringent and making modifications to a car without considering what the rules dictate are allowed for a specific class will result in the car being bumped up into a class that it will likely not be competitive in.
The following are some general suggestions based on current information at the time that this text was written. Make sure to consult the current rule book to verify this information before making any changes or modifications. We will not be responsible for the accuracy if this information with the constantly redefinition and rewriting of rules that the SCCA does, and this is only a general suggestion of possibilities to guide to the areas of the rule book to verify these suggestions before making changes or modifications.

There are some things that can be done to improve driver control and ability that will not affect what class is desired to race in:
• Drivers School.
• Racing Harness.

Stock class is a little misleading. The SCCA writes the rules based on allowing the replacement of parts that are deemed to wear out, and restrict what choice of replacement based on the desired performance restrictions in any given class. Stock may sound like cars just as they roll off the showroom floor, but some modifications are allowed:
• R Compound Racing Tires.
• Lighter weight alloy wheels which match the stock diameter, width, and offset.
• KYB Shocks.
• Isuzuperformance double adjustable damper, fixed spring perch struts.
• Isuzuperformance Front
  OR
  Only Sway Bar.
  The 2012 rule change allows for "Substitution, addition, or removal of a single anti-roll bar and supporting hardware...". This is a significant rule change. The previous rule allowed for change only to the front sway bar, and was benifitial to RWD cars only. The new rule allows for eigher front or rear, providing the same benefit to FWD cars.
• Isuzuperformance Cat Back Exhaust.
• Torquemaster Spark Plugs.
• Upgrade Ignition Wires.
• K&N Air Filter
• Best quality OEM replacmeent brake rotors.
• Performance/Racing Compound Brake Pads.
• Isuzuperformance Stainless Steel Woven Brake Lines (on pre-92 cars).
• Fine tune alignment (toe and camber) within factory adjustmenet range for better turning.

This class is marketted at the import performance crowd and was designed to bring import drag racers into autocross. The class allows some rather sophisticated modifications, but restricts some others that would be expected for serious drag racers and people building a performance street car, so the class has a somewhat split personality:
• 140 Tread Wear Tires on Wider and Larger Diameter Wheels (see width restrictions for specific classes in rule book).
• Isuzuperformance Coilovers.
• Isuzuperformance Camber Plates.
• Isuzuperformance Front and Rear Sway Bar.
• Isuzuperformance Lower Tie Bars.
• Isuzuperformance Polyurethane Suspension Bushings.
• Isuzuperformance Polyurethane Steering Rack Bushings.
• Isuzuperformance Polyurethane Engine Mount Bushings.
• Isuzuperformance Polyurethane Rear Cross Member Bushings (AWD) (subject to rule interpretation).
• Isuzuperformance Polyurethane Differential Carrier Bushings (AWD).
• Isuzuperformance Cold Air Intake.
• Isuzuperformance Tri-Y Header (Non-turbo).
• Isuzuperformance Tubular Turbo Manifold for stock IHI Turbo (Turbo) (subject to rule interpretation).
• Isuzuperformance Cat Back Exhaust.
• Isuzuperformance High Flow Catalytic Converter (STX and STU only).
• Isuzuperformance Underdrive Pulley Set (crank, power steering, and alternator).
• Isuzuperformance Windage Tray.
• Isuzuperformance Adjustable Fuel Pressure Regulator.
• Accel 300+ Ignition System (subject to rule interpretation).
• Torquemaster Spark Plugs.
• Upgrade Ignition Wires.
• Short Throw Shifter.
• Isuzuperformance Limited Slip Differential(s) (STX, STU, and STR only).
• Isuzuperformance Front Big Brake Kit.
• Isuzuperformance Rear Big Brake Kit.
• Isuzuperformance Stainless Steel Woven Brake Lines (on pre-95 cars).
• Wings, Spoilers, and Air Dams.
• Adjust alignement (toe and camber) for maximum turning ability.

This class is designed for cars that are modified but still street legal, and are intended for use both on the road as well as on the track:
• R Compound Race Tires on Wider and Larger Diameter Wheels.
• Isuzuperformance Coilovers.
• Isuzuperformance Camber Plates.
• Isuzuperformance Front and Rear Sway Bar.
• Isuzuperformance Lower Tie Bars.
• Isuzuperformance Polyurethane Suspension Bushings.
• Isuzuperformance Polyurethane Steering Rack Bushings.
• Isuzuperformance Polyurethane Engine Mount Bushings.
• Isuzuperformance Polyurethane Rear Cross Member Bushings (AWD).
• Isuzuperformance Polyurethane Differential Carrier Bushings (AWD).
• Isuzuperformance Cold Air Intake.
• RC Engineering Heavy Breather throttlebody porting.
• Isuzuperformance Tri-Y Header (Non-turbo).
• Isuzuperformance Tubular Turbo Manifold for stock IHI Turbo (Turbo).
• Isuzuperformance Cat Back Exhaust.
• Isuzuperformance High Flow Catalytic Converter.
• Remove AC System or bypass AC pulley with Non-AC accessory belt.
• Isuzuperformance Underdrive Pulley Set (crank, power steering, and alternator).
• Isuzuperformance Adjustable Cam Sprockets.
• Isuzuperformance Adjustable Fuel Pressure Regulator.
• High flow fuel injectors if needed.
• Iperformance Stand Alone Computer Systems.
• Accel 300+ Ignition System.
• Torquemaster Spark Plugs.
• Upgrade Ignition Wires.
• RC Engineering Heavy Breather Throttlebody Porting.
• Extrudehoning Upper and Lower Intake Manifold.
• Upgrade Intercooler (Turbo).
• Isuzuperformance Blow Off / Compressor Bypass Valve and Intercooler Pipe (Turbo, subject to rule interpretation).
• Electronic Boost Controller (Turbo, mounted out of reach of driver).
• Stock spec engine rebuild, maximum of .0472 inch overbore, internals may be balanced but not lightenned.
• Isuzuperformance Aluminum Radiator.
• Electric radiator Fan / Upgrade Radiator Fan.
• Short Throw Shifter.
• Isuzuperformance Aluminum Pressure Plate Clutch.
• Isuzuperformance Aluminum Flywheel.
• Isuzuperformance Limited Slip Differential(s).
• Isuzuperformance Front Big Brake Kit.
• Isuzuperformance Rear Big Brake Kit.
• As of 2010, drum brakes may be converted to disk brakes regardless of up-date-back-date rule. Hoever, a functional emergency brake is required.
• Isuzuperformance Stainless Steel Woven Brake Lines (on pre-95 cars).
• One Piece Racing Bucket Seat.
• Below Bumper Air Dams.
• Rear Spoilers up to 10 Inches Tall.
• Adjust alignement (toe and camber) for maximum turning ability.

This class is designed for cars that are modified and may no longer be street legal. X Prepared provides an additional allowance for non-US spec vehicles (JDM, right hand drive, etc.):
• Strip interior of carpet, side panels, dash, etc.
• Remove passenger seats.
• One Piece Racing Bucket Seat for driver.
• Floor pan and firewall must remain in tact, specific allowances for changes are listed in the rule book.
• Polycarbonate windows.
• Rear Spoilers up to 10 Inches Tall.
• Racing fuel cell.
• Fiberglass hood, hatch, trunk lid, and fenders.
• R Compound Race Tires on Wider and Larger Diameter Wheels (widths regulated for each class).
• Isuzuperformance Coilovers.
• Isuzuperformance Camber Plates.
• Isuzuperformance Front and Rear Sway Bar.
• Isuzuperformance Strut Braces.
• Isuzuperformance Lower Tie Bars.
• Isuzuperformance Polyurethane Suspension Bushings.
• Spherical bearings may be substituted for suspension bushings.
• Modifications to suspension arms, spindles, etc., is unrestricted.
• High ratio steering rack permitted.
• Isuzuperformance Polyurethane Steering Rack Bushings.
• Isuzuperformance Polyurethane Engine Mount Bushings.
• Steel engine and transmission mounts are permitted.
• Isuzuperformance Polyurethane Rear Cross Member Bushings (AWD).
• Isuzuperformance Polyurethane Differential Carrier Bushings (AWD).
• Isuzuperformance Cold Air Intake.
• RC Engineering Heavy Breather throttlebody porting.
• Isuzuperformance Tri-Y Header (Non-turbo).
• Isuzuperformance Tubular Turbo Manifold.
• Upgrade / change in turbocharger is permitted.
• Isuzuperformance Cat Back Exhaust.
• Isuzuperformance High Flow Catalytic Converter.
• Remove AC System or bypass AC pulley with Non-AC accessory belt.
• Isuzuperformance Underdrive Pulley Set (crank, power steering, and alternator).
• Isuzuperformance Adjustable Cam Sprockets.
• Camshaft regrind.
• Larger intake and exhaust valves.
• Head porting.
• Upgrade fuel pump.
• Isuzuperformance Adjustable Fuel Pressure Regulator.
• High flow fuel injectors if needed.
• Iperformance Stand Alone Computer Systems.
• Accel 300+ Ignition System.
• Torquemaster Spark Plugs.
• Upgrade Ignition Wires.
• RC Engineering Heavy Breather Throttlebody Porting.
• Extrudehoning Upper and Lower Intake Manifold.
• Upgrade Intercooler (Turbo).
• Isuzuperformance Blow Off / Compressor Bypass Valve and Intercooler.
• Electronic Boost Controller.
• Racing engine rebuild, .0472 overbore limit, pistons and valves must be metal, but are unrestricted, crankshaft must retain same stroke.
• Oil system unrestricted, dry sump system permitted.
• Isuzuperformance Windage Tray
• Isuzuperformance Aluminum Radiator.
• Electric radiator Fan / Upgrade Radiator Fan.
• Short Throw Shifter.
• Isuzuperformance Aluminum Pressure Plate Clutch.
• Isuzuperformance Aluminum Flywheel.
• Isuzuperformance Limited Slip Differential(s).
• Transmission gear ratios may be modified.
• Final drive ratio may be modified.
• Isuzuperformance axle shafts.
• Isuzuperformance drive shaft.
• Isuzuperformance Front Big Brake Kit.
• Isuzuperformance Rear Big Brake Kit.
• Brakes unrestricted, no emergency brake requirement.
• Below Bumper Air Dams.
• Adjust alignement (toe and camber) for maximum turning ability.

There are some things that can be done to improve driver control and ability that will not affect what class is desired to race in:
• Drivers School.
• Racing Harness.

The National Auto Sport Association takes a very different approach to writing rules. They have divided cars by stock performance level into groups which are more or less a ladder order. This provides a baseline grouping for competition. Modifications to the vehicle have been assigned points, based on the effectiveness of the modification to enhance the performance of the vehicle. A vehicle owner is allowed to modify the vehicle and remain within the same class until the modifications total a set number of points, and then the vehicle is moved up into the next class. The logic being that once the modifications total the set limit number, the performance of the car has been enhanced to the point that it should be moved into the next higher rung on the classing ladder.
It is to the competitor's advantage to do as much to enhance the performance without moving up into a faster group of cars. So the competitor will then attempt to find the most effective group of modifications to maximize the performance of the vehicle, without breaking into the next higher class. This can be a very expensive and labor intensive tuning process of trial and error installing and un-installing various parts to find out what combination yields the best performance while remaining within the points limit.
If NASA decides that the vehicle's performance is exceeding the level of the rest of the cars in the class it is in on the ladder, they can bump it up to run in a higher class.
For highly modified cars, dyno testing and a test drive by a NASA official may be required for classing.

This sstem provides significantly more flexibility and is extremely friendly to the car enthusiast who may have made one or two serious modifications that would bump the car into a highly modified class in a system baszed on adhering to a list of alloable modifications.
However, there are some downsides.
A serious competitor will probably have to perform every modification on the points list and test every possible combination within the desired point limit to determine what yields the best performance.
And, the system assigns the same number of points to a modification for every vehicle. This ignores the fact that a modification may yield more power on Brand X, Model X car, as compared to Brand Y, Model Y car.

Please consult the NASA website for more information about their classing system.

The Sports Car Club of America divides cars into different classes based on the level of preparation (modification) to the car above the level of stock, as well as the relative performance level of the car itself. This is to equalize competition and make racing a contest of driver ability.
Of primary importance when looking into car preparation is to obtain a current copy of the rules and follow the rules to make only modifications to the car which will allow the car to remain in the desired class of competition. The rules are very stringent and making modifications to a car without considering what the rules dictate are allowed for a specific class will result in the car being bumped up into a class that it will likely not be competitive in.
The following are some general suggestions based on current information at the time that this text was written. Make sure to consult the current rule book to verify this information before making any changes or modifications. We will not be responsible for the accuracy if this information with the constantly redefinition and rewriting of rules that the SCCA does, and this is only a general suggestion of possibilities to guide to the areas of the rule book to verify these suggestions before making changes or modifications.

There are some things that can be done to improve driver control and ability that will not affect what class is desired to race in, as well as the basic safety equipment requirements:
• Drivers School.
• Racing Harness.
• Roll Cage.
• Fire Suit.
• External Electrical Cutoff.
• Fire Supression System.

Improved Touring is a regional class, designed to provide an affordable entry level to racing.
Allowed modifications are highly limited to keep down the cost of participation.
Vehicle eligability is limited to cars produced after 1968 (at time of writing) and more than four years old, which were sold in the United States.
Vehicle models with factory turbochargers are specifically excluded from this class.
• Carburetor Conversion Allowed Provided Specific Rule Compliance In Rule Book.
• Removal Of Emissions Control Equipment Allowed.
• Isuzuperformance Cold Air Intake.
• Iperformance Stand Alone Computer Systems.
• Accel 300+ Ignition System.
• Torquemaster Spark Plugs.
• Upgrade Ignition Wires.
• Isuzuperformance Tri-Y Header (Non-turbo).
• Isuzuperformance Cat Back Exhaust.
• Isuzuperformance High Flow Catalytic Converter.
• Delete Catalytic Converter
• Stock spec engine rebuild, maximum of .0472 inch overbore, internals may be balanced but not lightenned.
• Manifold and Head may be ported but only within 1 inch distance from the valves.
• Isuzuperformance Windage Tray.
• Isuzuperformance Aluminum Pressure Plate Clutch.
• Isuzuperformance Polyurethane Engine Mount Bushings.
• Isuzuperformance Aluminum Radiator.
• Electric radiator Fan / Upgrade Radiator Fan.
• Upgrade or Add Oil Cooler.
• Remove Air Conditioning System.
• Isuzuperformance Limited Slip Differential.
• Final drive ratio may be modified.
• Isuzuperformance Coilovers.
• Isuzuperformance Camber Plates.
• Isuzuperformance Front and Rear Sway Bar.
• Isuzuperformance Strut Braces (Per Rule Specifics).
• Isuzuperformance Lower Tie Bars (Per Rule Specifics).
• Isuzuperformance Polyurethane Suspension Bushings.
• Spherical bearings may be substituted for suspension bushings.
• Performance/Racing Compound Brake Pads.
• Isuzuperformance Stainless Steel Woven Brake Lines.
• Brake Proportioning Valve(s).
• R Compound Race Tires on Wider and Larger Diameter Wheels (See Specifics In Rule Book).
• Strip interior of carpet, side panels, dash, etc.

Super Touring class is designed for former World Challenge class cars, and cars prepared to the rule set.
Vehicles must have been produced from 1985 through current year. Vehicles produced prior to 1985, but whose models production extended to or past 1985 are allowed.
STO class targest vehicles over 3.2 liters. STU class targest vehicles under 3.2 liters. STL class targets non-turbo vehicles under 2.0 liters, with more limited modifications to the engine and chassis.
STO and STU classes allow vehicle models which were originally equipped with factory turbochargers.
Recent rule changes for STO and STU classes have stated allowances for upgrading the turbocharger on originally turbochargers cars, and also adding turbochargers to cars that were originally not turbochargers, "On a case by case basis to be reviewed by the board". How these new allowances are implimented has yet to be seen.
All vehicles are required to run a inlet air restrictor to limit engine power level. The size of the restrictor varies and is determined by the sub-class, engine displacement, if the engine has forced induction, and the vehicle weight.
• Front Splitter Per Rule Book Specifics.
• Rear Wing/Spoiler Per Rule Book Specifics.
• Strip interior of carpet, side panels, etc. But Dash Must Remain and Rear Parcel Shelf Must Remain.
• Drive Shaft Hoops / Loops Required.
• Lexan Windows and Windshield Allowed
• Engine Swap Within Same Vehicle Manufacturer Allowed.
• Racing engine rebuild, .040 overbore limit, pistons and valves must be metal, but are unrestricted, crankshaft must retain same stroke.
• Isuzuperformance Valves, Valve Springs, Lifters, and Retainers (but no titanium allowed). See rule specifics for valve size limits.
• Camshaft Regrinds Per Rule Specifics.
• Accel 300+ Ignition System.
• Iperformance Stand Alone Computer Systems.
• Removal Of Emissions Control Equipment Allowed.
• Alternate Size Fuel Injectors Allowed, Original Fuel Rail Must Remain.
• Isuzuperformance Fuel Pressure Regulator.
• Torquemaster Spark Plugs.
• Upgrade Ignition Wires.
• Isuzuperformance Windage Tray.
• Manifold and Head may be ported but only within 1 inch distance from the valves.
• Compression ratio may be changed by modifying the head or piston (alternate pistons), see class specifics for compression ratio limits.
• Turbo Boost Controller (electronic or otherwise) allowed, but must be out of reach of the driver.
• Isuzuperformance Cold Air Intake.
• Isuzuperformance Aluminum Radiator.
• Electric radiator Fan / Upgrade Radiator Fan.
• Upgrade or Add Oil Cooler.
• Remove Air Conditioning System.
• Isuzuperformance Tri-Y Header (Non-turbo).
• Isuzuperformance Tubular Turbo Manifold.
• Isuzuperformance Cat Back Exhaust.
• Isuzuperformance High Flow Catalytic Converter.
• Delete Catalytic Converter
• Short Throw Shifter.
• Isuzuperformance Aluminum Pressure Plate Clutch.
• Isuzuperformance Aluminum Flywheel.
• Isuzuperformance Limited Slip Differential(s).
• Transmission gear ratios may be modified (May not be allowed for STL class).
• Final drive ratio may be modified.
• Isuzuperformance Coilovers.
• Isuzuperformance Camber Plates.
• Isuzuperformance Front and Rear Sway Bar.
• Isuzuperformance Strut Braces.
• Isuzuperformance Lower Tie Bars.
• Isuzuperformance Polyurethane Suspension Bushings.
• Spherical bearings may be substituted for suspension bushings.
• Modifications to suspension arms, spindles, etc., is unrestricted.
• Manual steering rack permitted, but may not be modified.
• Isuzuperformance Polyurethane Steering Rack Bushings.
• Isuzuperformance Polyurethane Engine Mount Bushings.
• Steel engine and transmission mounts are permitted.
• Isuzuperformance Polyurethane Rear Cross Member Bushings (AWD).
• Isuzuperformance Polyurethane Differential Carrier Bushings (AWD).
• Isuzuperformance Front Big Brake Kit (Except STL class).
• Isuzuperformance Rear Big Brake Kit (Except SLT class).
• Isuzuperformance Stainless Steel Woven Brake Lines.
• Performance/Racing Compound Brake Pads.
• Brake proportioing valve permitted.
• ABS delete permitted.
• R Compound Race Tires on Wider and Larger Diameter Wheels (See Specifics In Rule Book).

There are some things that can be done to improve driver control and ability that will not affect what class is desired to race in:
• Drivers School.
• Racing Harness.

The National Auto Sport Association takes a very different approach to writing rules. They have divided cars by stock performance level into groups which are more or less a ladder order. This provides a baseline grouping for competition. Modifications to the vehicle have been assigned points, based on the effectiveness of the modification to enhance the performance of the vehicle. A vehicle owner is allowed to modify the vehicle and remain within the same class until the modifications total a set number of points, and then the vehicle is moved up into the next class. The logic being that once the modifications total the set limit number, the performance of the car has been enhanced to the point that it should be moved into the next higher rung on the classing ladder.
It is to the competitor's advantage to do as much to enhance the performance without moving up into a faster group of cars. So the competitor will then attempt to find the most effective group of modifications to maximize the performance of the vehicle, without breaking into the next higher class. This can be a very expensive and labor intensive tuning process of trial and error installing and un-installing various parts to find out what combination yields the best performance while remaining within the points limit.
If NASA decides that the vehicle's performance is exceeding the level of the rest of the cars in the class it is in on the ladder, they can bump it up to run in a higher class.
For highly modified cars, dyno testing and a test drive by a NASA official may be required for classing.

This sstem provides significantly more flexibility and is extremely friendly to the car enthusiast who may have made one or two serious modifications that would bump the car into a highly modified class in a system baszed on adhering to a list of alloable modifications.
However, there are some downsides.
A serious competitor will probably have to perform every modification on the points list and test every possible combination within the desired point limit to determine what yields the best performance.
And, the system assigns the same number of points to a modification for every vehicle. This ignores the fact that a modification may yield more power on Brand X, Model X car, as compared to Brand Y, Model Y car.

Please consult the NASA website for more information about their classing system.

• Drivers School.
• Racing Harness.
• Helment for anything quicker than 13.99 seconds in the quarter mile.
• Roll Bar for anything Quicker than 11.49 seconds in the quarter mile.
• Fire Suit for anything quicker than 11.49 seconds in the quarter mile.
• Axle and Drive Shaft Hoops for anythign quicker than 11.49 seconds in the quarter mile.
• Roll Cage for anything quicker than 10.99 seconds in the quarter mile.
• Clutch Scatter Shield for anything quicker than 11.49 or 10.99 seconds in the quarter mile (subject to interpretation). (Possible requirement for use of slick tires).

Drag racing involves repeated launching the car from a standing start, up to 80+ MPH, or whatever speed the vehicle can manage to attain in a quarter mile of asselerating.
Taking all of the slopiness out of the drivetrain nets immediate performance improvement. And, eliminating the slopiness before adding power will reduce problems and possible damage when power is added.
In addition to this, reinforcing and upgrading pieces that will be seeing increased stress will prevent breaking parts now and in the future.
• Sticky Tires on Light Weight Wheels.
• Racing Slicks (caution, increased friction will slow the car after 50 feet if engine power is below 160 HP).
• Isuzuperformance Polyurethane Engine Mounts, because the stock mounts will rip themselves apart with repeated high RPM launches.
• Performance Clutch, because the stock clutch will burn up quickly with repeated launches.
• Isuzuperformance Limited Slip Differential(s).
• Isuzuperformance Coilovers. Increase rear stiffness on FWD cars.
• Good quality CV axles and driveshafts that can handle the stress of repeated launches.
• Adjust alignement (toe and camber) for maximum straight line performance.

Just like tuning for the street, engine power can be easily improved by concentrating on improving air flow into and exhaust flow out of the engine.

• Isuzuperformance cold air intake system.
• Isuzuperformance 2 1/2 inch cat back exhaust system.
• Isuzuperformance Tri-Y header.
• Isuzuperformance high flow catalytic converter.

Acceleration is improved by reducing the weight of rotating assemblies.

• Isuzuperformance underdrive pulley set (crank, power steering, alternator.
• Fidanza aluminum flywheel.
• Isuzuperformance Aluminum Clutch Pressure Plate.

Fine tuning the engine control with bolt on parts and upgrading the computer control system will bring power up further. The importance of a fully programable computer system an not be overstated. This will allow for fine tuning to match the modifications, modern fuel blends, higher octane fuel, and even alternate fuels. Absolute control of the fuel curve, spark curve, and air fuel ratio can provide 20% or higher power increase when compared to the factory computer system.

• Isuzuperformance Adjustable Cam Sprockets.
• Camshaft regrind.
• Upgrade fuel pump.
• Isuzuperformance Adjustable Fuel Pressure Regulator.
• High flow fuel injectors if needed.
• Iperformance Stand Alone Computer Systems.
• Accel 300+ Ignition System.