I agree completly with DVSNCYNIKL. Its gonna be tough to find much aftermarket stuff for a Lumina, in fact, I havent seen much for any of the Chevy sedans.Im not sure what other Chevy's use the 3.1L, but you might be able to use performance parts from a different car, if the engine is the same.My suggestion would be to take a cruse to some performance shops in your area, and ask em. At the very least you can probably get a K&N Filter, possibly some sort of CAI, and Headers / Exhaust.
Good luck, and post what you find or decide to do
