Best way to start?

[malibuguy]

Originally Posted by str8Yaris

u need good back pessure on your car if u want it to perform

NO! back pressure of any form is bad.

the stock xB exhaust is 1 5/8" in diameter, its retarded small for performance use. I had made my own full 2" mandrel-bent exhaust on my '06 xB i had & it really liked it.

Get an intake, header (i have a JDM header i'm trying to get rid of) & a real full exhaust with a true high flow metallic core catalytic converter, axle-back exhaust only free up 1-2whp, so don't waste your time

thats enough to make a noticeable difference that you will feel & enjoy