m3 stock headers on 325 m54b25
Hi everyone. So this is what I was thinking. I have a 02 325i. the Cat is going bad (rattling) and I am in need of new ones. I have looked at exhaust options, Headers w/cats, headers w/o cats w/ o2 sims, and oem/ aftermarket manifolds w/cats.
I was wondering if anyone has ever tried using m3 headers w/cats on a non-m car.
I know the flanges don't match the block so you would have to cut the old (325) flanges off and install on (m3) headers. not sure about section 2 alignment from (325)->(m3)
I have been thinking about taking on this project and I'm testing the waters to see if anyone has tried this before. Thanks
p.s. I live in Ca so Smog is a must, otherwise I would run 325 aftermarket Headers.