View Full Version : Exhaust piping question

03-26-2003, 07:24 PM
I'm going to get some exhaust work done over the weekend, and I'm wondering what diameter piping I should use?

I read about alot of forced induction cars using 3" diameter piping, but that's usually for 4cyl japanese cars. On my last car I used 2.5" piping, and I felt quite a bit of backpressure loss, but it wasn't too bad. I figured I'd see what other tuning companies use, and they're usually using 2.12" piping, but that doesn't seem much larger if at all compared to stock piping.

Which route should I go? I don't want to go overkill on it because I could actually end up losing power instead of gaining. Do you think BMW's engineers thought through the e36 exhaust system enough that I should perhaps retain the same diameter piping or go larger?