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Everything I've heard and read suggest the CP mufflers are indeed more aggressive sounding than non CP. For that reason, the CP mufflers are more sought after, and therefore harder to find on the used market. The ones that are out there typically sell for well over $1000 while you can get non CP for $500-$700
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2014 BMW 650GC M sport
2011 BMW 550i M-sport/AW 
1991 Nissan 300ZX Twin Turbo
2007 Chevrolet Corvette Z51 (sold)
2001 BMW 325ci (sold)
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