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The rear four-piston calipers are so much bigger than the stock two-piston units that the overall weight of the rear brakes is 4 pounds heavier than stock. Subtracting the 2 pounds lighter front brakes leaves us with an overall weight gain of only 2 pounds-not bad for the quantum leap in brake power we gained. As in the brakes, the rear brakes now have a pad over twice as big as the stock pads. This will make for much longer life and much better track performance.