[swamp2]

I always like to remind folks that there is no such thing as a free lunch with LSD mods.

You can increase wheel torque but you really need engine crank hp to make your car faster across a broad spectrum of different scenarios. Gains achieved with additional wheel torque are offset by the ability to stay in each gear for less time. In comparison to an unmodded competitor identical except you went for a aftermarket rear diff ratio in each and every gear, near redline, you will need to shift while the fellow running stock gearing will still be pulling. You'll be in gear n+1 while he'll be pulling MUCH harder in still in gear n. Repeat this across all gears and the loss from the effect is significant.