well... why don't you say the trouble of doing it twice, and get yourself a motor and work on it while the one with the 140k is still in ur ride? because if you do what you just said, their will be a period of time (probably a long one) where you won't be driving the stang...
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K&N CAI, BBK TB, Pacesetter dual exhaust adaptor, Magnaflow dual exhaust, Steeda Tri ax shifter, GT front brakes, 8.8" rear, 3.73s
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