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      02-21-2019, 10:49 AM   #14
Josh_G
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Drives: BMW M2 Competition
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Quote:
Originally Posted by doughboy View Post
As the S55 always had secondary CATs in the mid section (same as N54) then an S55 "CAT back" has always been from secondary cats back ie not from the downpipes like N55.

Now on EU S55 the OPF replaces secondary CATs then a CAT back is now OPF back. Does that make sense?

This OPF back includes "mid silencer" just in front of rear subframe, and pipes forward from mid silencer (which some may call mid pipes) but only up to the back of the OPF.
just confirmed that with ML performance... everything i had read on the Miltek had led me to believe it was cat not OPF back. just waiting on a price for the 200 cell mid pipe and i'll go with the MTC VRSF clone DPs
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