Here is a list of modifications that I have come up with that will appear stock, unless you disassemble everything and actually inspect it. If you have any tips you would like added, let me know!
----this pages is constantly updated.
Suspension
KYBGR2 struts - don't waste time with Monroe are Gabriel replacement struts. The KYBs are worth their price tag.
Since you have to have stock springs, you might consider heating them up and re-bending them to sit lower. Just remember that this will weaken them, so don't jump any speedbumps.
-If you have the cash, get a stock looking replacement set from SpringWorks:
http://www.springworks.com/auto-coil-spring-order.html
Swap on the GSi rear crossmember and swaybar--it is a direct swap and look completely stock.
-modify the endlinks on the swaybars to help preload the wheels for the turns.
Adjust negative camber to max as stated in rules.
-Wheel spacers - will widen the stance. You might experiment with just having the spacers on one side of the car, or diagonal wheels.
Tires, tires, tires....get the good ones...
Engine
Replace the plug wires if they are old, you do not want to have a misfire at high revs
Advance timing a couple more degrees & increase octane to compensate for detonation.
replace all of the grounding wires in the engine bay with HEAVY DUTY copper wires and run a nice thick grounding wire to the ECM case.
3angle valve job - bring the head back up to spec with a good, clean seal.
Port the head, intake plenum, Exhaust manifold
Phenolic or Teflon spacers between the intake manifold and the head.
Increase the compression ratio by:
-Shave the head
-Deck the block
-Overbore pistons
-SOHC: swap in the 1.6L DOHC pistons
-Custom pistons with an overbore and increased Compression ratio.
-installing longer spark plugs or boring the spark plug hole so the stock spark plug sits deeper into the chamber, increasing the compression ratio.
Cams:
SOHC - -if you don't already have one, get a 93 Base Storm Cam. It has a different profile that produces more torque-which is good for quicker acceleration out of the turns.
DOHC - Swap on the 1.8L cams or the 89 IMark RS cams if you have a DOHC engine.
-If you have the cash, get a custom Cam grind.
Drivetrain
Swap on the GSi Axles. The passenger side has a halfshaft, which helps reduce torquesteer.
Swap in the GSi Transmission, it has a shorter gear ratio and allow for higher revs in lower gears
Limited Slip Differential (LSD):
Phantom grip LSD--should help out on a dirt track with less traction available
If you have the Cash, get a Quaife LSD. It is probably the best upgrade you could do to your car.
Brake pads-get a good set, EBC and Hawk are very good brands.
