How much of an increase in power at the wheels can I expect if I already have a JWT intake and warpspeed y-pipe? I don't want it to be too loud or any additional vibration, so I could I just get a b-pipe instead to use with my stock muffler? And how much of a gain would I get by adding a b-pipe and who makes the best and most quiet one.

 

I have the exact same question. JWT "b-pipe fix" $50 and $75 with resonator. I guess resonator is obviously quieter, but don't know if you need it with a stock muffler.