If you're looking to upgrade your ride's clutch system, the ACT HD/Race Sprung 4 Pad Kit TC1-HDG4 is a solid choice that I can personally vouch for. This kit comes with ACT's heavy-duty pressure plate, which is pretty much their bread and butter. The design is all about maximizing clamp load while reducing deflection, which means you're not just getting a clutch that lasts longer but one that performs better under pressure. I’ve put this pressure plate through its paces, and I can tell you that the four-stage heat-treating process really does wonders for performance.

What I appreciate is the precision cover stampings that add a level of rigidity and consistency you can feel in the pedal. Now, let’s talk about the 4-pad spring-centered race disc. It’s built to dampen torsional vibrations, which makes for a quieter operation—definitely a plus when you're cruising around town. Even when you push it hard, you won't have to worry about it failing on you. The wraparound spring windows and thicker retainer stampings work together to keep everything in check, reducing stress concentrations and boosting reliability. Sure, the engagement is a bit harsher, but that means faster shifting, and if you’re like me, you’ll appreciate the responsiveness, especially in smaller engines where every bit of performance counts.

Installation is straightforward, and if you're a DIY enthusiast, you’ll appreciate the detailed instructions. Just CLICK HERE to grab the guide.

Here’s what you can expect with this kit:

• Light to moderate pedal effort, which means it’s manageable but still aggressive when you need it.
• Moderate friction life, thanks to that special diaphragm design that ACT is known for.
• Engineered for high performance, using select ceramic friction materials that can handle the heat.
• Perfect for high horsepower street or race applications—this isn’t just for show.
• Every unit is 100% clamp load tested and dynamically balanced, ensuring reliability at high RPMs.

Specifications:

• Clutch Master Cylinder: Not included
• Grease: Yes, it comes with it
• Grade Type: Performance
• Flywheel: Not included
• Pilot Bushing: Not included
• Pressure Plate Type: Heavy Duty
• Release Bearing: Included
• Clutch Disc Diameter: 8.3 inches (212 mm)
• Disc Material: Ceramic
• Input Spline Quantity: 21
• Input Shaft Diameter: 0.9375 inches
• Alignment Tool: Included
• Disc Type: Sprung Solid
• Pressure Plate Bolts: Not included
• Clutch Slave Cylinder: Not included
• Flywheel Bolts: Not included
• Pilot Bearing: Not included
• Product Weight: 12.1 lbs.
• Torque Capacity: 305 ft/lbs, which is a nice bump over OE specs.

Fitment: This clutch kit fits a range of models including:

• Geo Prizm (1990-1991)
• Toyota Celica (1989-1991)
• Toyota Corolla (1989-1991)
• Toyota MR2 (1985-1989)

In short, if you want a clutch that can handle the heat of both street and race environments, the ACT HD/Race Sprung 4 Pad Kit is where it’s at. It’s built tough and designed for performance—just what you need to keep your ride in top shape.