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There are one or two guys that have swapped them before, but I remember reading that it was quite the pain to get them out, especially the rear manifold. for the gains, I don't think I want to swap mine for some OBX's. Maybe if TRD made them and I knew they were a direct bolt in. Plus if this is your DD, odds are they will down for a few days. With a car that's 10+ years old a broken bolt or two is something you must expect. Hopefully you won't break one off in the head.
If I just HAD to have them, I'd have an exhaust shop install mine for me. That way if something needs to be welded or modified, it can be done on the spot.
I also remember reading that our factory manifolds aren't that restrictive, I think it's just the lower crossover pipe that is rather flat is where the main restriction is. If that was just swappable, I would consider that.
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