[KingLT1]

I have had the Flowmaster NPP for a couple seasons now. I like it other then I do get some drone with the valves open but I do have cat deletes. The valves being closed is significantly quieter then open. I do think the exhaust would be about perfect with cats. So for that reason I have the Corsa NPP on order. CSP had a good sale on it over the Holidays so I decided to try it. Probably just wasting money at this point but I had a few Holiday bucks to spend. Take note you don't gain power from any exhaust mod post cats, so you are essentially spending a grand or two for looks and sound. I definitely wouldn't want to give up the NPP function if you have LT headers and/or cat delete's. These cars get stupid loud and having the ability to quiet the exhaust note is Nice when you just want to cruise around and not make a bunch of noise. Really loud exhaust gets old after a while imo.