Chris, correct. If you have an aftermarket diff and you track frequently, this sort of thing will payback over the long-term. And it will give you more certainty that your diff is protected from overheating... For folks that do enduros / track their car often or in very high temps (AZ summers), it's a good investment. Otherwise, if I were only doing occasional track days, I'd take the risk of not having one... you can get a new diff for about the price of a kit like this FYI
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