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with 420 rwhp,and a few weight reductions like a tubular front k member (which most turbo kits require anyway) you should keep up with a stock gt500. They put down between 415-430 rwhp stock from what ive seen but they weigh as much as an oceanliner....
you'll end up spending so much money on the turbo and all the other stuff you break trying to keep up w a shelby you might as well just buy something with more hsp then a mustang ie: vette, evo, crotch rocket