i would say you will def need a tune. i did a motor swap in my 04 and went one motor size up and needed to. even if you just put in a stock 6.0 tune but would be best to just have a tune done to compensate for the headers and stall. as far as the headers i dont know about the plug wire issue but i do believe hearing that they fit real good. and as far as the rest should be direct swap and should bolt up fine. give JP a call 843-608-8LSX(579) about the tune stuff and even questions about the swap. he messes with this stuff all the time. good luck
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IM BAD BOB
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