I've been looking at realoem and searching the forums on this... but there's a little back and forth and varying information and wanted confirmation.
Are the ZHP/330i muffler section the same diameter as the section 2 OEM pipes from E46 M3?
In other words, could I chop off the M3 mufflers for my S54 swap with the OEM M3 headers, section 1 + 2, and weld on ZHP mufflers to maintain that stock appearance without backflow issues from diameter shrinking issues?
Real OEM shows the the ZHP mufflers use 50mm (~2") clamps, but some posts show they are 2.25" or 2.5"... I don't have an OEM ZHP exhaust to confirm physically.
Thank you all!