Quote:
Originally Posted by zaimer
Have tried removing the fuse for the NPP exhaust valves? I'm not sure how loud you want to go, but that is satisfactory for many. I did it on my NPP and I haven't put it back in. It is audible but I wouldn't call it loud, unless you are into the throttle, revving, cold start, etc. I have debated getting a louder (aftermarket) exhaust but I'm afraid of it being too loud. Particularly at times where I want to be more quiet (leaving in the morning, late at night). The NPP (open valve) cold start is loud in the morning, I have no doubt that at least one of my neighbors has to be able to hear it.
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The only thing that does is keep the valves open while cruising on the highway. If you're in track, that is the only time the valves close. It's to prevent drone.