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Do a search for Fredvon4's recomendations on breaking in a new truck and you'll see what I mean.
My truck has sticker on the underside of the hood that specifies that it is not intended for sale in California. There is no EGR on it.
The '08 exhaust appers to be all new from where the manifolds terminate back to the tailpipe. Massive new hangers, all clamped on heat shields, new catalytic converters and 2 into 1 collector. I doubt the aftermarket has responded with a bolt in cat back replacement. A cat back system for an '05-'07 would probably work with little modification though. A muffler swap only would be easy for any competant shop.
I have a 40 series 3" flowmaster I'll probably swap in and see how it sounds, I am curious with the resonator what will happen. (My 03 V10 has original cat and no muffler and I love it, but I am kind of twisted and like to hear it scream!)