If you're looking to upgrade your Mazda Miata's clutch setup, the ACT HD/Race Sprung 4 Pad Kit (ZM4-HDG4) is a solid choice. This kit features ACT's Heavy Duty pressure plate, which is known for its durability and performance. The unique diaphragm design increases clamp load, which means you get better engagement without sacrificing longevity. Plus, they put their diaphragms through a rigorous four-stage heat-treating process, so you know they can handle some serious heat.

Now, let's talk about the 4-pad spring-centered race disc. It's designed to dampen those torsional vibrations, which makes for a quieter ride. But don’t get it twisted—this setup is all about performance. You’ll notice that engagement is a bit harsher, but that’s just the nature of the beast. It allows for faster shifting, which is perfect if you’re pushing your Miata to its limits on the track or just having some fun on the back roads.

One of the best things about this kit is how it’s built. The pressure plate has precision cover stampings that add rigidity, and the spring retainers are designed with wraparound spring windows. This not only boosts strength but also helps reduce stress concentrations, making it reliable under tough conditions. It's a well-thought-out piece of engineering that’s perfect for high horsepower street or race use.

Install Instructions:

• For Instructions CLICK HERE

Features:

• Light to moderate pedal effort with aggressive engagement—expect some gear rattle, though!
• Moderate friction life, but extended thanks to that ACT diaphragm design.
• Precision-engineered with select ceramic friction materials for high heat tolerance.
• Perfect for high horsepower street or race applications.
• 100% clamp load tested and dynamically balanced for smooth operation at high RPMs.

Specifications:

• Clutch Master Cylinder Included: No
• Grease Included: Yes
• Grade Type: Performance
• Pilot Bushing Included: No
• Pressure Plate Type: Heavy Duty
• Release Bearing Included: Yes
• Clutch Disc Diameter: 8.8 in (224 mm)
• Disc Material: Ceramic
• Input Spline Quantity: 23
• Input Shaft Diameter: 1 in
• Alignment Tool Included: Yes
• Disc Type: Sprung Solid
• Pressure Plate Bolts Included: Yes
• Clutch Slave Cylinder Included: No
• Flywheel Bolts Included: No
• Pilot Bearing Included: Yes
• Product Weight: 13.4 lbs
• Torque Capacity: 359 ft/lbs
• Torque Capacity Over OE: 0.71

Notes:

• Designed for 6-speed applications only. Pressure plate bolts included (M8-1.25 x 20mm).

This kit fits the Mazda Miata from 2006 to 2015. If you're serious about your Miata's performance, this clutch kit is a no-brainer.