[Ian SS]

For me I really enjoy the way the NPP system sounds as it comes from factory. Probably one of the best sounding factory exhaust on the market IMO.

What I did was delete my secondary cats. Very easy and low cost. The biggest thing is you don't notice a difference at idle, but it will blast your eardrums at full throttle. Plus you still retain NPP functions and can toss it in stealth mode at any time.