if its a 3.8 dont do exhaust. look in the visual mod sections do reading in there a lot of stuff to take in. most common is tint, inlays, and someother stuff. make sure you read this though
http://www.grandprixforums.net/safel...0-a-67580.html
http://www.grandprixforums.net/ultim...0-a-49055.html