I've had my M6 coming up on a little over 5 years now, personally I went with Eisenmann race exhaust rear section, titanium resonator delete and AA Catless 3.5" downpipes. Car doesn't sound muffled or have the in cabin drone like many of the muffler delete cars I've been in.
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DME Stage III, Catless Downpipes, SSP Basket & Clutches, 3.5" Custom Intakes & Eisenmann Race Exhaust
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