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I think this stuff works in engines where the coolant passages (particularly around the pump) were poorly designed. That creates cavitation and reduces cooling. Not really an issue here.
I've used it in higher HP turboed cars in conjunction with Methanol kit's in summer weather - it would lower IAT's 10-15 degrees at least..... RS6's Typically and my last E63 build.
Not the same results for all cars and use cases for sure.