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      11-01-2012, 10:31 PM   #196
Second Lieutenant
Puerto Rico

Drives: 335i Coupe 2007
Join Date: May 2011
Location: Puerto Rico

iTrader: (0)

Originally Posted by NoTempoLimitN54 View Post
The only way to definitively answer the question about the construction of the BMW Performance exhaust without cutting one open is to have one x-ray'ed.

Are there not large x-ray machines used to inspect aircraft parts for metal fatigue that could work for this.

Yesterday a 335is drive past me while I was waiting to make a left turn (and he's turning left from 90 to my right. He was accelerating quickly so I got a good chance to hear the is exhaust. Then I drove off and heard my own exhaust (stock 335) for comparison.

It seems to me that the sound of the is exhaust had a similar character to stock, except that it was louder and had more of the higher pitched noise.

So maybe it is the same design with less packing...?
My neighbor has a 335is with catless DPs and it sounds awesome. I haven't heard a 335i with the PE exhaust yet, so I can't compare, but is hard to imagine it can sound better than the 335is exhaust