Quote:
Originally Posted by JFM-jr
What does the NPP valve bypass? I fail to see it unless these are like the stock muffler and the valve bypasses internal baffling
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The muffler is 3inch in and 2 x 2.5inch out, when its closed he effectively has a 2.5 inch exhaust system, when its open its a 3 inch system with quad 2.5inch exits