Check out the B&B Triflo from Bavarian Autosport. I really love mine. By the way, their prices are cheaper than going straight to B&B. Mark W '88 535is (B&B Triflo) '85 M535i (Stock Exhaust) I have an 87 535iS. I have seen the only two performance exhaust makers being SuperSprint and stromung. Which is better? Are there any other alternatives? Thanks