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      10-04-2011, 02:31 PM   #33

Drives: '08 135/ '11 1M
Join Date: Oct 2007
Location: at Death Valley 127

iTrader: (1)

Originally Posted by marcel b View Post
HP Autowerks wrote that they took the midpipe of the 135. Maybe a difference between N54/N55 version of the 135
Sorry, maybe I didnt clarify. I had an aftermarket exhaust on the 135. The midpipe was replaced and I am going to test that piece with the stock M axelback before I start looking into a complete exhaust system.

The rear section of the M seems to have minimal restriction, the mids seem to be identical to the 1 series so I expect to see gains in power and sound. My 135 was borderline too loud and I anticipate the M with my mids in place to be similar if not identical.

My 135 is N54 BTW