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Beans burned a pretty good one for me, its almost as good as the TW I have. I going to have Beans touch it up some then it might be better then the TW.
Downpipe and exhaust. And I would also consider an intake as well. Many of us do a poor mans intake called the 6637. Riffraff diesel sells a kit, or you can look the stuff up yourself and save a few bucks.
Downpipe and 6637 first. The 31/2" exhaust is fine until you can afford a 4", just get rid of the cat and muffer. Pyro gauge then chip. Boost is nice but its not a performance thing, its a WoW thing!