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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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