I'm thinking about putting a better exhaust onto the e34, and a friend recommended an aeroturbine muffler. He has it on his 99 ford contour SVT and it made a world of difference, but I know a ford and a BMW are 2 different animals. Would I be able to use a single 3030 (3" inlet and outlet) muffler, or would it be better for me to put in 2 2525's (2.5" inlet and outlet), since the car has dual exhaust up to the muffler? It's actually rather interesting how the mufflers work, check out the tech here. If this would be a bad idea, I'm thinking about the bav auto tri-flo, or the remus, but I think that the aeroturbine would be my best bet. Help me out, gurus of bmw's!