Hybrid Racing Clutch Master Cylinder Upgrade (06-15 Civic & 02-06 RSX) Small Perfect upgrade for our K24

Perfect upgrade for our K24 / K20Z3 upper coolant housing

which gives you a bit better idea what they are

Comes with and without flow adjuster

Synchrotech® 1st or 2nd Pro Series Carbon Synchro

Improves handling while cornering and over uneven roads

Hybrid Racing Clutch Master Cylinder Upgrade (06-15 Civic & 02-06 RSX) Small Perfect upgrade for our K24Factory 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