I don't have the NPP on my v6, and am looking for an upgrade. I like the sound from all the videos of the borla ATAK, and seem to be well liked overall. I am not sure if it voids the warranty, or perhaps just warranty related to exhaust?
My bigger question though is specifically if anyone knows the difference in sound compared to the gm performance exhaust... Isn't that also made by Borla? The one found here:
http://www.shopchevyparts.com/perfor...-92289358.html
Overall it seems I could get either for a similar price. Probably cheaper for the ATAK. Although since I wouldn't do the install myself, I'd be in a similar boat price wise.