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As for the 1:1 gear ratio debate it depends on the dyno being used and how it calculates horsepower. Some dynos may not take into account the gear ratio being used and calculate power based on the speed of the rollers and the mass of the vehicle only. Obviously at this point a lower gear gives a higher mechanical advantage.
I don't think the Mustang works quite that way and the gear selection has less of an outcome on the horsepower/torque numbers.
Either way it was all done in a consistent manner and saw very good gains when you look at the percentages.
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