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MTI has been tuning LS1s since day one, and when they load the shop's base tune-up, they are 95 percent done. Cohen said that each car requires just three or so hours of driving, part and full throttle dyno time to nail the computer program. MTI also recommends that you start researching aftermarket rear ends, as the massive amount of torque and horsepower that is generated by these engines can fry one in a hurry. Sounds like a tough problem to have.