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Is it just me or does anyone else think the NPP is too raspy sounding in stock form? It sounds really good at low-mid throttle but once it goes WOT at high rpms it starts sounding obnoxious and raspy?
I have tried to play with HP tuners tables and command the valves closed at WOT, but its still just as loud.
With the valves closed it does look very restrictive having to flow through those small holes. I have measured with 5hp difference (as advertised with the corvette NPP) with virtual dyno comparing stealth mode to track with virtual dyno.
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