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      08-05-2014, 11:25 AM   #18
rennis
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Drives: E70 5.0 & B5 S4
Join Date: Mar 2012
Location: Kirkland

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The M Performance muffler is most assuredly quite different than a non- M Performance 50i. The MPerf unit is valved and has two outlets from the suitcase to the exhaust tips - it is significantly louder than non Perf. package 50i, which has no valves and a suitcase design that is far to quiet and restrictive for the vehicle, IMO.
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