Quote:
Originally Posted by cjperformance
Something to consider, and look into, since im not positive you can do this.... but you may be able to lock the npp valves closed (quiet mode) via a tune change. I believe there are some tweaks in the tune to open or close the valves in whatever manner you want.
If i recall there were tweaks for throttle percentage, rpm, etc... if so, it would satisfy at least one goal of not having to get UNDER the car.
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I thought I saw someone's old post on here (maybe a year or so ago) where they kept the valves closed during an auto-x or track day and melted their rear fascia. I believe they kept the valves in stealth mode. I'll try and search for it and edit this post if I find it...
To the OP, I know some folks use Laguna Seca pipes, but I don't think that solves your issue as they simply help direct the noise to a certain direction.
However, check out the following thread, the poster in this thread added an additional muffler to reduce sound:
https://www.camaro6.com/forums/showthread.php?t=576096
Edit: Found the example of melted fascia with NPP in stealth mode. Post 6 in the following link:
https://www.camaro6.com/forums/showthread.php?t=585360