Quote:
Originally Posted by jeffinsd
I'm ready to pull the trigger and, so far as I can see, the NPP thing is there just to make it louder, and adds no performance. That's part of why I joined the forum is to help me decide if that particular option is worth paying for.
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Well I can certainly tell you that NPP with the valves closed is whisper quiet. I can barely hear the engine at all. Now that I have headers I can still barely hear it with the NPP valves closed! If the stock muffler is as quiet as the NPP with valves closed you won't have any issues with loudness
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2016 camaro 2SS hyper blue/Kalahari, A8, MRC, NPP, sunroof, SW headers through axleback, Circle D 3600rpm TC, Pray ported IM/TB, E85
Sold: 2002 Z28, NBM, M6, 460rwhp, 2009 HHR SS
RIP : 2002 WS6 Black, A4, 355rwhp
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