Hey everyone, Im looking to help bump up the MPG in my GTP, every other car i've had has had great sucess with a freeflowing cat vs. stock.
But i like the power, combined with silence of the Gtp in its current state.
I cant seem to find any solid info on JUST swapping the downpipe making a difference in sound or not. every thread i have read shows "i swapped a downpipe, and exhaust" I want to keep my factory exhaust.
Does anyone know if JUST swapping the downpipe will increase the sound any? if i am about to drop 200-300 on a downpipe, I want to make sure its going to be what i want. and more exhaust sound is NOT what im looking to gain.
