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I didn't know the M5 mufflers were so loud - did you remove your cats and resonator?
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RIP: 2015 Black Sapphire Metallic 650i Gran Coupe, 343 Wheels, Michelin Pilot Super Sports 255 F / 285 R, M6 Front Grilles. Coming - M6 Comp. Mufflers, Carbon Fiber Diffuser & Spoiler.
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