My .02 cents worth:
Start with the S5 if you are not good at swapping wiring harness. Be careful as many of the S5 cars have single piston front calipers and small brakes.
Start with 86 sport (Lightest ever and has 5 lug with good 4 piston calipers) if you are motivated to swap the harness.
Run the complete S5 motor setup (more torque) and seriously look at aftermarket injection computer for tuning.
5.12 is the best all around gear and they are now available again. I have 5 that are all spoken for but a new batch will be available in a few weeks. I prefer the factory clutch pack LS unit but many like the torsen. If you like to curb hop go with the LS.
Run the GTUS (legal) fifth gear. Comp has them but it is best to get someone who has the proper tools to do this for you. You will not find this gear in a junk trans.
Make sure the cage goes into the door cavity as all the later cars have very heavy window guts.
Aluminum hoods are usually found on the convertibles so go hunting. (I have about 10 so I can tell you that now)
Plan on running a very big oil cooler (Mike V at ISC Racing sells a really nice one)
Good luck if you decide to build one and I am sure many of the RX drivers will be glad to give you their pointers.
Add up the items I listed and your suspension parts alone and you will be better buying a wrecked/junker to steal expensive parts from.
Steve Eckerich
ITS 18 Speedsource RX7
ITR RX8 (under construction)
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