I did some searching and really couldn't find much on it. Is it worth it to get one(b-pipe) with a y-pipe and cai already installed?Another question is does it make it alot louder and does it give enough hp gains to justify the price?btw I am keeping my stock muffler because I don't want it to loud.

thanks in advance

 

oh also a high flow cat.

 

The b-pipe doesn't give much power. It's more for sound. If you decide on a b-pipe, definitely get the resonator.