Big pipes, small pipes, long pipes , short pipes. I think we are getting into exhaust tuning for scavenging the cylinders, valve overlap, lift and timing etc. Throw in ram induction on the intake for max torque at a specific rpm, and you are talking high rpm, high out put engines. Not a concern with the M. I have seen guys use a plain old down spout off their house just to get the noise out of their ears but still not have that "back pressure" associated with a baffled muffler. Harm the valves, no.
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