Just do gears and a LSD. I just put gears in my GT and could not be happier, my gas mileage went up 1 mpg in city driving and it is a lot quicker. As far as top speed, you don't need to worry about that. 5th is overdrive so it is geared to bring you above 200mph if you have the power. However, it takes a massive amount of power to get that fast. Gears will actually increase top end too simply because you will be further in powerband in 5th gear.
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2005 Redfire GT
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