Hey whats up everyone, Im kinda new to this forum. To be honest I've been browsing through the topics here for quite some time, but i was always too lazy to reg.. anyways here i am..

heres the question.

Anyone know what size the stock 2001 Xterra SE piping is? I just recently put on a flowmasters 40 series exhaust, I cant say that im un happy with it, but its a bit too quiet for my tastes.

Im planning on increasing the size of the piping, but will that make a significant difference? And if so, what size piping should I use? Gas mileage is killing me but logically, the bigger the pipes, the bigger the flow, and the bigger the flow, the more gas it'll consume correct?

Any thoughts/comments?