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      02-21-2019, 09:32 AM   #13
doughboy
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Drives: 2018 M2 Comp 6MT
Join Date: Jan 2009
Location: UK

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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.

Last edited by doughboy; 02-21-2019 at 09:38 AM..
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