> I know for a fact No 1. It make the engine sound cooler, and no2. it'll > make a performance increase.... I dunno, I was running one I cleaned out for a while (not any more ;-)) and it will ring if you don't sleeve it or something. Not a real pretty sound, and it's right under the pass. compartment. -- Huw Powell http://www.thebook.com/human-speakers/audi-main.htm