Quote:
Originally Posted by geaux_tigerss
I put 2" TSP headers no cats to my factory NPP catback. With the NPP valves closed it isn't much louder than stock. NPP valves open..... wake the dead.
Before I did headers I had pulled the fuse on my NPP. Occasionally I would wake the wife and kids in the morning when I left for work. After headers I put the fuse back in and have been starting it in stealth mode. I haven't woken anyone since then.
So I guess to summarize, headers with NPP valves closed is quieter than factory manifolds with NPP valves open.
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Do you have cold start tuned out? I'm considering headers to go with my Corsa NPP. Planning to tune cold start out and the NPP to stay open in sport mode so I can keep the fuse in. I really need the car to be acceptable with the neighbors as I leave in the morning at 3 AM.