How do the gm parts compare to all the other aftermarket parts......such as the new cat back, the exhaust tips, the manifold(header)......how do they compare to the other brands out there....cause im trying to keep my extended warranty.

Thanks

 

Its a lot to ask someone to search for something when they have no clue what their looking for.
This link 06 Dyno numbers will give you a good indication of what to expect. Also this one Official Exhaust Thread will be helpful.

Enjoy the site

 

thanx bro....im LOVING the GMPP Sport Exhaust right now.....the reviews...the soundclips/videos...and best of all the price

 

aftermarket is always gonna be better, the factory is always conservative on what it does where as the aftermarket goes for the best gains