NPP --- Mild to not-so Wild
04-25-2015, 10:42 AM
#1
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NPP --- Mild to not-so Wild
I have a 2009, automatic with the NPP exhaust set up.
I want more sound that what the stock system gives me, but pulling the fuse is too much sound and drone. What I need is some kind of device that limits the movement of those muffler vacuum valves so they are not completely open when the fuse is removed. I know there is something out there, but I can't seem to find it. Anybody know where I can find what I'm looking for?
Thanks
I want more sound that what the stock system gives me, but pulling the fuse is too much sound and drone. What I need is some kind of device that limits the movement of those muffler vacuum valves so they are not completely open when the fuse is removed. I know there is something out there, but I can't seem to find it. Anybody know where I can find what I'm looking for?
Thanks
04-25-2015, 01:30 PM
#2
Safety Car
Folks have used collars or small hose clamps on the flapper actuator pistons to prevent them from opening all the way.
04-25-2015, 01:58 PM
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Burning Brakes
04-25-2015, 06:59 PM
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C6 of Year Finalist (performance mods) 2019
Down and dirty is to take off the vacuum line to one and keep the other one closed. Instant 50% of excess sound.
06-07-2015, 09:13 AM
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Thanks --- but I took the easy way out and ordered this http://www.nakidparts.com/adjnpp.html
The perfect solution for me.
The perfect solution for me.