Start with one of these kits, http://www.newspeedmaster.com/html/ai_removal_kit.html and then richen the mixture a bit. A pair of more open mufflers such as Epco Stainless will help by getting the hot exhaust out quicker. To restore the finish, there are a number of polishes such as MAAS or Simichrome.

Let's hope there's intelligent life somewhere in space 'cause it's buggar all down here. -- Monte Python