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The M Performance sound definitely improves with age as the insulation wears out....it's like a Stradivarius!
Actually I wonder if the perforated OEM exhaust mod sounds more like the MPE exhaust, as the MPE's exhaust design is unrestricted, with perforated pipes surrounded by insulation..though probably the MPE's rare Inconel/Titanium combo does create some unique harmonics at higher RPMs.
Last edited by FogCityM3; 01-06-2013 at 11:02 PM..
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