Which Is Deeper Which Is More Loud ??
Which Is More Worth The Money??

 

vibrant louder, deeper and more expensive

 

Vibrant will yeild more HP as the GMPP has the same size exhaust pipe as the stock system.

 

GMPP = deeper/better tone
Vibrant = louder

Haven't seen a dyno sheet for the Vibrant yet, but Jonel posted an excellent before/after dyno of the GMPP with a 12hp gain.

Honestly, I don't like the sound of the Vibrant at all. Loud and annoying, and if I had to drive a long distance cruising on a highway (which I often do) I think I'd shoot myself.