Quote:
Originally Posted by RideWithDanger
Corsa NPP valves closed is louder than stock with valves open. At a warm idle the Corsa NPP and stock NPP are very close though, Corsa just sounds better. These are the numbers from Corsa in their direct comparison:
Stock NPP closed – 91.3 db
Stock NPP open – 94.0 db
Corsa closed – 97.5 db
Corsa open – 108.4 db
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I bought the Corsa NPP axlebacks last month and it is going on the car this Friday. There was a huge sale at CSP for less than $2100. I am actually puzzled with the numbers above. I think those numbers are based on full throttle in Stealth/Touring and Sport/Track mode, because there is no way the part throttle or idle is providing that much decibels. Some people mentioned at idle and part throttle the Corsa sounds even quieter than stock NPP. My understanding is no matter what mode you are in, the butterfly valves in the exhaust opens up with full throttle. Maybe not all the way with Stealth/Touring mode. The valves also open in cold starts for a split second too then close.