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I am going full dual exhaust just like on the M and am making custom parts for the front facia as I like the look of the facelifted z4 but it needs a little help in making it look agressive. But also making it look OEM and not tunerboy I'm not installing the M front but liked the look of the rear dual that only the m had it makes the car look just right. So
I'm installing the M rear bumper to make room for the other muffler.

So far I'm about $2000 in parts but loving the project. Could be done cheaper but going full OEM parts which ain't cheap.

I'll have a full write-up on it soon.

I was surprised to find a lot of attachments for the M are on our cars, theirs already the bolts their on the right side where the fuel emissions are that allow the placement of the other exhaust hanger, this made it possible to easily locate placement for the muffler so it all seats right.