need some advice on what exhaust to use for my 99.5 a4 1.8tq. i want dtm tips, and need a full cat back system at least 2.5 in. i really like the way the neuspeed looks and the price, however i have never heard what one sounds like. i also really like the scorpion but again i have not heard that one either. I would like a deep low tone, not too loud but loud enough to know that it is not stock. any suggestions???? thanks Mike.