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I wouldn't say its a waste of money, but it better be cheaper than 2 piece rotor kits. The bigger brakes you get, the bigger the caliper will be, and you can't run a big brake pad with just one piston pushing it in the middle. Thats why you have kits with 4 or 6 pistons-- so that the force is spread out more evenly upon contact. Keep in mind that the actual total volume of those 4 or 6 pistons will (SHOULD) still equal the volume of your stock single piston. At least thats my current understanding...
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