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my guess would be since the tune only adds 10 - 20 hp depending on cai or not, that the stock 250 270 ish hp to the rear wheels GT is gonna go a smidge faster :P but i could be wrong. thats why on a forums you shoudlnt deal in absolutes :-x (yay star wars reference)
there isn't a comparison. These are two different class vehicles ....the GT will own the "tuned sixer"all day long.....unless FI'd or seriously bolted....not just tuned...imho