ACT Heavy Duty Clutch Kit 6 Puck Solid Subaru STI 2004-2021 / Legacy GT Spec B 2007-2009 | SB10-HDR6

This ACT heavy - duty clutch kit, model SB10 - HDR6, is a top - notch choice for Subaru enthusiasts. It fits 2004 - 2021 Subaru STI and 2007 - 2009 Subaru Legacy GT Spec B. Note that Legacy GT spec.B models need to use the STI flywheel to use this clutch. The kit features a rigid 6 - pad race clutch disc paired with an Xtreme pressure plate. You'll experience light to moderate pedal effort with aggressive engagement and it can handle up to 668 ft/lbs of torque. It's best for race use only. ACT's heavy - duty pressure plates use an exclusive diaphragm design. This design increases clamp load, reduces deflection, and maximizes clutch life. The diaphragms go through a four - stage heat - treating process for excellent performance. The pressure plates have precision cover stampings for rigidity and consistency. The 6 - pad rigid race discs are made of high - quality ceramic friction materials. The chrome - moly hub is heat - treated for strength and durability. Its lightweight and rigid design allows for quicker shifts and smooth service. The engagement with the 6 - pad disc is harsher but shifting is faster. It's recommended for larger clutch sizes to absorb more heat. The Monoloc is a one - piece replacement or upgrade for the standard two - piece wedge collar and wire ring in pull - type clutches. Its spring tension is carefully calculated for optimal performance, providing uniform loading on the bearing and pressure plate. The hardened chrome - moly steel construction of Monoloc ensures long - term service. The kit includes a 6 - pad rigid race disc, an Xtreme pressure plate, an alignment tool, a pilot bearing, and a release bearing. With 100% clamp load testing and dynamic computer balancing, it offers smooth high - RPM reliability and comes with ACT's patented Monoloc.

Using this ACT clutch kit is straightforward. First, if you have a Subaru Legacy GT Spec B from 2007 - 2009, make sure to install the STI flywheel before fitting the clutch kit. When you're behind the wheel, you'll notice light to moderate pedal effort and an aggressive engagement, which is great for races. But be aware that there will be increased gear rattle. For maintenance, keep an eye on the clutch components regularly. The high - quality ceramic friction materials in the 6 - pad disc are durable, but over time, they'll wear out. If you start to feel a change in the pedal feel or notice any slipping, it might be time to check the clutch. The pressure plates and the Monoloc part are built to last, thanks to their special heat - treating and construction. However, make sure to keep them clean and free from debris. Always use the alignment tool when installing the clutch to ensure proper alignment. And remember, this kit is designed mainly for race use, so using it for daily driving might not give you the best experience.