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Old 08-23-2007, 08:30 PM
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GMP GMP is offline
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Location: Jefferson Twp., NJ
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When the PV is closed at low RPM, the chamber is open to the port through the left drum valve. This changes the tuning of the system, like having a longer header section on the pipe. When the PV opens at higher RPM the chamber closes and is out of the equation.

The effect you feel has a lot to do with what pipe you run with it. I notice it more with the GG pipe than with the FMF, which is more of a low/mid pipe anyway. So, the GG pipe with the LTR cover is a win/win setup!
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