It is for an e30 318is m42, and is 2.5'' all the way. Standard iS exhaust is 2.25''. It has been stepped up using an adaptor.






It is loud, but only past a few thousand revs....need a chip so it can scream at 7500 rmp
The engine is running awfully at idle at the moment...trying to solve it.
Video:
[youtube][/youtube]



