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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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2016 Hyper Blue 2SS A8,NPP,Moonroof
Pray ported factory intake manifold Ported TB
Rotofab
ARH 1 7/8 longtubes hi flow cats AFM deleted E85
11.0@124.9
11.65@118.8 pump gas,stock tune/exhaust
New combo: Pray Performance Heads/cam
MSD intake manifold and Circle D 3C
554/491 on E85 all work & tuning done by Pray
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