I welded in a set of Kooks resonators before the axle with straight pipes back...also I am running Kooks Long Tube headers with their H and racing cats...sounds great.
I have been running my KB 2.6L with intercooler at 10lb of boost since October 2007 on stock bottom end with no problems...Remember it's all in the tune. A good tune and you should be fine and will have a lot of fun. :D