8 months ago i got a 3 inch cat-back put it, but im not sure if it bolted right up to my stock cat(i think it did, it took them like 20 mins). Well, im planning on buying the BOMZ high flow cat, and i want to install it myself....my only question is it says it bolts right up to stock, so should it bolt up to my 3 inch exhuast??? Thanks

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2003.5 M3
99 M3
99 GST

Your 3" cat-back exhaust probably came with a transition piece (2.25"-3"). If that's the case, then the high flow cat should have a 2.25" inlet/outlet, which is the stock exhaust diameter. So, it should bolt right up.

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Kon C

"Sometimes, a man has to do what a man has to do."