This is more of a general question more than specifically bmw but I have a 2004 325xi and I’m looking at making my car louder legally and without spending a lot. I was thinking a 40 series flowmaster. But my main question is the inlets and the outlets are 2.5 in diameter. I know stock it’s like 2.25 so my question is if I buy this and give it to a place to install it would it work? Or would I need inlets that match the pipe (2.25)? kind of a noob at this stuff but that’s why they have forums right? Lol
Moved from General Discussion sub-forum.
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