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Guys,
Just wondered if the exhaust valve is not just for noise emissions?
Quite commonly in the motorbike world they use a similar valve to improve back pressure in the lower-to-intermediate revs range and so improve low down torque. I wouldn't be surprised if you would loose a little of the torque way down low (say 1,300-2,500 rpm) by making this modification.
Just my 10$ worth.
Mad Chemist.
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