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+--- Thread: Strange detail in the muffler (/showthread.php?tid=5701)
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RE: Strange detail in the muffler - Roger the shrubber_imp - 11-10-2015
The US model VFR1200F uses the same valve.
RE: Strange detail in the muffler - rboe - 11-11-2015
It seems it's mostly on sport bikes that like to rev to infinity and beyond. Closed off, it increases low speed torque; the motor behaves better.