The Perrin Master Cylinder Brace eliminates the flex at the firewall, so you feel nothing but solid pedal feedback with every application of the brakes. Even slowing for a stop sign, the difference can immediately be felt after installation. Don't think your firewall flexes? Have a friend pump the brakes and watch the movement for yourself! Eliminate it effectively and quickly! The brace is CNC machined from 6061 billet aluminum for extreme stiffness. With stainless steel hardware and an anodized finish, the Perrin Master Cylinder Brace will look great and last the life of the car in even the harshest conditions.