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Cutting Brake Rotors

Brakes

Vehicle Information: Year: 1991; Engine (Size, Modifications): 3.3 Turbo; Total Mileage: 41000;

I have heard that Porsche does not want rotors to be cut. A friend owns a machine shop and has been in the business for many years. He tells me that it is okay to cut down the rotors as long as I don't go below the Min. spec. Is this true? What is the Min. spec. Is this a ploy to sell expensive rotors? The car might see one track event a year and maybe 4000 miles anually.

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