My suggestion is, since this is a track car and you are going to gut the thing anyway, find a SRT6 Crossfire with a ratty interior and swap in a manual box from a wreck or E-bay donor car. The SRT6 already has a LSD, lower stiffer springs and shocks and bigger brakes so you'll save yourself a lot of time and effort. Always cheaper and easier to just buy something close to you needs to start with. Save your base coupe for street duty or sell it to another forum member who wants to try the Auto-X game !

Cheers and Good Luck on the Track !

Slim