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      11-01-2012, 10:03 AM   #193
NoTempoLimitN54
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Drives: E92 335i
Join Date: Sep 2012
Location: Los Angeles, CA

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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...?
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