[335dsleeper]

Originally Posted by Searcher

Dave,

I hope you work with BPC to make sure of excellent fitment and ease of install. It would also be nice to see a 4" option as well for higher power cars.

I look forward to your results...

4" is excessive. 3" will support 600+ whp, which is more than any of us will likely see with a street driven 335d. Fitting a 4" exhaust would be a real challenge. 3" is pretty tight, I think you'd have issues getting a 4" exhaust to fit.