Hey..... I just got back from Installing my Eisenmann race exhaust on my 323ci. All I got to say is holy sh*t does it sound good. It sounds sort of like a race car but not as loud I choose to remove the second resonator and put Eisenmann's sound pipe on and I am glad I did because I think it would have not been loud enough for me. The only problem they had installing it was the exhaust pipe that goes in to the second resonator is an oval shape not round and the pipe eisenmann gives you is round so the shop had to heat the pipe to make the eisenmann sound pipe fit. This made me a little mad because for an exhaust that I paid $750 for should fit perfect. Other than that it went in with not head aches. I will post pictures of it later tonight and if anybody is thinking buying this system... DO IT... you won't regret it after you hear it. :thumbup: