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Replying to Topic '2.0 M6 Conversion to dual Exhuast'

If you're looking for performance increase by adding a dual muffler to your car, you'd be mistaken. Unless/until you fit a high-flow cat or change your extractors to 4-2-2 (4 outlets, 2 going to each pipe means 2 catalytic converters); you wouldn't gain very much in terms of performance.
 
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