[Staves]

I test drove NPP SSs before I got my SS with non NPP and now have non NPP Borla type-S.
I think the sound of mine will sound the same as NPP version just valves are always open.

I think the type S sounds amazing and better than the NPP from the factory. But it’s not a ton louder, maybe slightly. If I already had NPP, I doubt you’ll notice much of a difference.