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Re: Brake discs
drilling and grooving does make a difference. The question is if it's worth the price difference...
when you have had "warping" or squealing issues, grooved discs can be the answer, and some manufacturers now fit grooved discs to cure these issues on some models (it's the standard discs with 6-8 grooves machined into them, had to have it done a few times now for customers)
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