Gas Door ya not too bad. Just get one from a junk yard.
Change the oil in the SC every 30k. Get a windex bottle and use he sprayer to suck out the old nasty fluid and squirt it into a bottle to be thrown away. It will smell like rotten ass! Get more SC fluid from your local GM dealership.
Preferred Exhaust system is stock. If you want it more noisy then add aftermarket mufflers.
If you want it to flow better get Headers.
Check out this thread.
http://www.grandprixforums.net/safel...car-17482.html
