I have Mac mids with an off road y and flomaster exhaust. Pretty much my only mods. I am going LT's and TD's once spring comes. Heres a stupid little video of how my car sounds now.

http://s180.photobucket.com/albums/x...t=MOV00110.flv

Car got dyno'd(not tuned) and made 320hp and 333tq. Its an A4 so M6's would see more.