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Solid as a rock, the PERRIN Performance Master Cylinder Support quickly solves a long-time Subaru braking issue: flexing of the firewall under hard braking. *Easy Upgrade* The PERRIN Master Cylinder Stiffi is a quick and affordable upgrade that adds positive brake feel and increased style under the hood. The PERRIN Master Cylinder Support bolts from the brake master cylinder to the driver-side shock tower to give you a firm pedal feel. *Construction* The PERRIN Performance Master Cylinder STIFFI is machined from 6061 billet aluminum for extreme stiffness. *Finish* Anodized black with a bold PERRIN logo to dress up the engine bay & show off to your friends.