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The biggest determinant of volume is the muffler.
The second largest determinant, but much less so, is the section 2-- one big pipe is louder than two smaller pipes.
If you want quiet, you need a quiet muffler.
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2005 M3 Coupe, 2004 M3 Wagon, 2001 M5 Sedan, 2008 M5 6MT Sedan, 2012 128i M sport |