The 2002-2006 RSX, 2002-2005 EP3, 2006-2011 8th Gen Civic Si, 2012-2015 Civic Si, and 2004-2008 Acura TSX all have a known issue with their factory clutch master cylinders (CMC). If you look at the CMC on these cars more closely, you'll notice that all of these models have a triangular-shaped feedback plate positioned at the very end of the cylinder. This plate is basically a secondary valve that was designed to slow down the clutch engagement and reduce shock to the clutch itself and the surrounding drivetrain parts. This setup might be perfectly fine for people who just drive their cars for simple daily use, but the delayed engagement can cause wear to the synchros and possibly even the gears on performance applications. The reason is fairly simple: the factory CMC delays the clutch operation, so it does not open fast enough to keep up with a fast shift. This means that pressure is being applied to the transmission synchros during the shift, before they are ready for the actual gear change.

The K-Tuned Clutch Master Cylinder was designed to completely replace the original factory cylinder and offer real-time clutch engagement to support faster shifting. The factory clutch fluid reservoir is reused and connected in the same way it was in stock form. The only thing we suggest is checking out your slave cylinder on the trans to confirm it is leak-free. Aside from that, installation is pretty simple: install the parts and bleed the system using some new clutch fluid.