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This mod will increase performance across the whole powerband. It's not *just* a drag racing mod, but obviously it's a common drag racing mod. But if you haven't ever been in a car with a more aggressive rear end, I guess you just won't understand. This was a huge mod back in the muscle car days, but the science of it still holds today. It's a great performance mod. What it's worth to someone, I can't answer. Everyone has to determine that for themselves.

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