Join Date: 03-15-2004
Location: Rapid City, S.D., U.S.A.
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Re: Is this the PAIR valve?
The exhaust valve is simple mechanism used to vary exhaust backpressure which has effects on both torque and horsepower output provides more backpressure at low end where torque is on the rise. However this backpressure limits top end power due to it's adverse effect on peak exhaust flow. Peak flow is required to make maximum power yet is not as effective in making low end torque.
If I am wrong just blast me guys, but I am pretty sure this is the basic function behind your valve and is essentially the same principle for any internal combustion engine.