Midpipes do matter. Mids for the e46 M3, for example, cause a torque gain/loss range of ~80 ft lbs at mid/low RPM and +-50 hp at high rpm.
Titanium exhaust, especially for headers, is short sighted. They all crack given real world use.
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2005 M3 Coupe, 2004 M3 Wagon, 2001 M5 Sedan, 2008 M5 6MT Sedan, 2012 128i M sport
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