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Perrin Master Cylinder Support WRX / STI (2002-2007) Honda Skunk2 designs their fuel railsThe Perrin master cylinder support brace for the Subaru WRX STI provides the much needed support for the master cylinder and brake booster that the stock setup just can't provide. When force is placed against the brake pedal, the brake booster and master cylinder will actually flex, and over time can fatigue to the point of failure. The designers at Perrin have devised a simple plan to fix this problem; a brace cut from 6061 aluminum that bolts to the