Quote:
Originally Posted by JFM-jr
Im not sure if your talking about it quieting down over the life span mileage since install or quieting down over the course of an individual driving cycle. If its the latter then I can say the NPP valves even in Track mode will modulate and change depending on speed. Its definatley quieter at 60mph cruising then it is even gently accelerating from a traffic light.
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It should get louder the more they bake in. MINE definitely did in regards to the secondary cat delete straight pipes even my wife noticed after they were on a couple months.