Clutch Masters Master Cylinder Upgrade Kit

The Clutch Masters MC15020 is a master cylinder upgrade kit specifically designed for 2015 and newer Subaru WRX and STI models. A key feature of this upgrade is the elimination of the factory-installed clutch delay valve, which can slow fluid return and negatively impact quick gear shifts, especially between 1st and 2nd gear. By removing this valve, drivers can experience more immediate clutch engagement for faster shifting. For applications requiring a slight clutch delay or slip to protect the drivetrain from shock, a tunable Flow Control Valve is available separately. It offers a direct plug-and-play installation and is compatible with OEM slave cylinders. The master cylinder is available in a 0.75-inch bore size and comes in various color options: black, red, and purple. Applications: 2015-2021 Subaru WRX/STI and 2022+ Subaru WRX.