Originally Posted by Weasel410
Out of curiousity, is the flange from the exhaust section to the mid pipe a 3'' donut flange?
I think it is less than 75mm's/3 inches. I looked on RealOEM.com
but it doesn't show the ring gasket's diameter. You could order that gasket and measure it. (# 18117553130) I know the N55 mid pipes measure 58 mm's for the most part.
135i, N55 mid pipes measure 58mm in outer diameter.