I'm thinking about putting the CSi exhaust on my '91 850i and I'm at least pretty sure that it can be done. I did a search for the topic and didnt come up with much, so thats why I ask. Do you guys know if I could get the CSi exhaust from Gault and/or how much it would run me? And I'm probably just looking for the center res and the cans (w/ tips.) Anybody have any input? Thanks