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Yes but with valves closed, the gas flow doesn't pass through the muffler, right?
At the oem exhaust there are 1 inlet pipe and 2 oulet pipes (1 w/opened valves) from the muffler. Akrapovic exhaust has 2 inlet pipes and 2 oulet pipes. Mpe for M3/4 has 4 inlet pipes and 2 outlet pipes.
In the M2 Mpe exhaust I can't see inlet pipe and outlet pipe from the muffler clearly.
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