Jeffrey G (Audi Dude), I remember that some of the "extreme mods" guys(450 plus hp and turbos the size of GE turbofans) on the Supra page mentioned heat-wrapping their IC piping, downpipes etc. Perhaps a quick post to www.supras.com will give you what materials they are using. Phil C. 96 A4q2.8 slushbox (its the wifes but I love it) 88 Supra Turbo 5spd w.mods (300+hp)