I recently installed the Hooker system along with a test pipe.What a hige difference! The car formerly had the Flowmaster system with the single factory style muffler.
I read this and I was very suprised at the HP/TQ increase:
Pypes Complete Cat-Back System - GM High-Tech Performance Magazine
I read this and I was very suprised at the HP/TQ increase:
Pypes Complete Cat-Back System - GM High-Tech Performance Magazine