Thread: Quietest downpipes
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      06-15-2021, 02:32 PM   #32
Reprosal
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Drives: 2022 BMW M3XC
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Quote:
Originally Posted by mike@x-ph.com View Post
The power difference is not significant on this engine even if you go from stock to catless. The sound difference is
Most dynos show 15hp going from catted to catless without a tune though no?
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