I dont know what your budget is but there is always the option to have exhaust made for you by a local shop or if you know how to weld. This will also allow you to use whatever size tubing you want. I have found it hard to find a complete exhaust system that isnt stock. I am in the process of fabricating exhaust right now myself. I am thinking of running dual pipes, no cats, and possible just some glasspacks instead of mufflers...all three inch tubing, This i just a thought. Also I have heard good things about the doug thorley headers sold on rugged rucks. although like i said a little pricy.