Hybrid Racing Clutch Master Cylinder Kit Honda Civic FD2Factory clutch master cylinders in the 06 15 Civics are known to be rather unreliable and because of their poor design and quality, it can lead to premature failures of critical parts throughout the drivetrain. High RPM grinds are mostly attributed to the OE master cylinders' inability to transfer fluid effectively to the slave cylinder, thus causing grinding and rasping of the gears and synchros since the clutch disk hasnt fully disengaged. Upgrading