you can do quite a bit to the tpi engines. alot of people dont understand that if you do a few good bolt-ons you basically have an l98, do a few more and you can easily push it close to an lt1 as far as 1/4 mile acceleration goes. throttle body bypass, filters or a cold air system, headers, AFPR, computer chip, exhaust system, then work on the drivetrain with maybe an aluminum driveshaft and youll have a pretty quick car. if you just do some simple mods like the filters, exhaust, headers etc. and you have the engine tuned well you can run around mid 14's. i know from expirience, dude.