Hybrid Racing Clutch Master Cylinder Upgrade 06-15 Civic Si / 02-06 RSXUpgrading the clutch master cylinder and clutch line from Hybrid Racing changes the system to an older, more direct and efficient system. This improvement allows the driver to feel a more consistent and direct clutch pedal which also improves shifting at high rpms. Helps to eliminate grinds during hard shifts OEM Honda master cylinder Stainless steel braided clutch line Improves the feel of gear changes