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  See more parts for Mazda Miata
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ACT HD/Race Sprung 4 Pad Kit Mazda Miata 1990-2005 - ZM2-HDG4

If you're looking to take your Mazda Miata's performance up a notch, the Advanced Clutch HD/Race Sprung 4 Pad Kit ZM2-HDG4 is definitely worth considering. I've had my fair share of clutches, and let me tell you, this one stands out. It features ACT's Heavy Duty pressure plate, which is known for its robust diaphragm design that really cranks up the clamp load. This means less deflection and a longer clutch life, which is something every enthusiast appreciates. Plus, the four-stage heat-treating process they use? That’s the kind of attention to detail that translates to real-world performance.

The pressure plate itself is built to last, with precision cover stampings that add rigidity—no flimsy parts here. Now, about the 4-pad spring-centered race disc: it’s designed to dampen torsional vibrations, which makes for a quieter ride. I’ve pushed this kit through some tough conditions, and I can vouch for its reliability. Sure, engagement is a bit harsher, but that’s what you want for faster shifts, right? It’s particularly great for smaller disc sizes in smaller engines like the Miata.

Installation is straightforward, and if you need a hand, you can grab the installation instructions here. It doesn’t come with everything—like the clutch master cylinder or pressure plate bolts—but it does include grease and an alignment tool, which is a nice touch.

In terms of features, you’re looking at a light to moderate pedal effort with aggressive engagement. The friction life is solid, thanks to that unique diaphragm design. It's engineered for high horsepower street or race use, and trust me, it’s been 100% clamp load tested and dynamically balanced for smooth high RPM reliability. The ceramic disc material can handle high heat, so you won’t have to worry about fading under pressure.

Here are some specs if you’re into the nitty-gritty:

  • Clutch Disc Diameter: 8.8 in (224 mm)
  • Input Spline Quantity: 22
  • Input Shaft Diameter: 0.9375 in
  • Torque Capacity: 310 ft/lbs
  • Weight: 12.4 lbs

This kit fits the Mazda Miata from 1990-1997 and 1999-2005, making it a great upgrade for anyone looking to boost their ride's performance. If you're serious about your Miata, this clutch kit is a solid choice that won't let you down.

Other Part Numbers:
ACT #actZM2-HDG4

Proposition 65

⚠ WARNING: Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov

Vehicle
1990-1997, 1999-2005
 Mazda Miata

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ACT ? Advanced Clutch Technology | Clutch Kits & Flywheels Built to Handle Real Power

If you've added boost, tuned for more power, or simply want better throttle control, then your stock clutch won't cut it. That?s where ACT (Advanced Clutch Technology) comes in delivering high-performance clutch kits and flywheels designed for real drivers who push their builds on the street, strip, or track.

ACT?s lineup includes everything from daily driver friendly HD kits to hardcore twin disc setups for serious horsepower. Whether you?re launching hard in a WRX, drifting in a 370Z, or canyon carving in an M3, ACT gives you the torque capacity and engagement you need without sacrificing drivability.

Why ACT? Because Power Without Control Is Useless.
  • Hold More Power Engineered to handle turbo, supercharger, and high-compression builds
  • Faster Engagement Stronger pressure plates for better bite off the line
  • Better Pedal Feel Balanced response without going full race-car stiff
  • Reduced Rotational Mass Lightweight flywheels improve rev-matching and response
  • No Guesswork Direct-fit applications, no fabbing, no hassle
ACT Clutch Kits and Flywheels Fit the Cars Enthusiasts Build

ACT doesn?t just make universal performance parts ? they build complete, vehicle-specific clutch solutions for enthusiast favorites. Whether you daily a Civic Type R, track a Subaru STI, drift a 240SX, or drag a Mustang GT, ACT offers the right clutch to match your build goals.

Top supported platforms include the Nissan 350Z/370Z, Toyota Supra A90, Chevy Camaro SS/ZL1, Mitsubishi Evo, Ford Focus RS/ST, and BMW M3/M4 ? each with clutch options tuned to your driving needs.

What ACT Offers:
  • Performance Clutch Kits From HD street kits to twin-disc race systems
  • Clutch Discs 6-puck, full-face, rigid or sprung to match your style
  • Pressure Plates Heavy-duty options that increase clamp load without sacrificing control
  • Chromoly Lightweight Flywheels Quicker revs, smoother shifts, and less drivetrain stress
  • Complete Hardware Kits Everything you need for a proper install
Performance Tested. Driver Approved.

ACT isn?t hype ? it?s proven. Their clutches are SFI-certified, track-tested, and used by racers in drag, time attack, autocross, drift, and rally. But what really matters? They hold power, last longer, and feel right even after hundreds of hard launches or hours of canyon carving.

Whether you're upgrading for more power or replacing a tired OEM clutch, ACT gives you the bite, strength, and feel to drive harder with confidence. No compromises, no excuses just parts that work when it matters.

ACT warrants all products to be free of defects in materials and workmanship for normal use and service for a period of one (1) year from retail purchase. Written notice must be immediately given to ACT within the warranty period. We require a copy of the purchase receipt showing the unit was purchased from an Authorized Dealer or Advanced Clutch Technology directly to verify the product is under warranty. Products purchased used do not carry a warranty. This warranty is to the original purchaser and is non-transferable. All non-warranty items are subject to a $50 inspection bench test fee.

ACT reserves the right to examine any part returned for warranty claim to determine, to ACT's satisfaction, whether the material or workmanship of the part does not conform to this limited warranty. ACT's obligation under this warranty shall be limited to repairing, replacing, or crediting, at its option, any part which is deemed covered by ACT. No labor, lift or storage charges will be reimbursed for any reason. Damage to ACT's parts resulting from misuse, improper use, or abuse shall void this limited warranty. Failure to follow ACT's installation instructions and the vehicle manufacturers installation procedures and specifications shall void this limited warranty.

ACT undertakes no responsibility for the quality of the goods except as otherwise provided in this contract. ACT assumes no responsibility that the goods will be fit for any particular purpose for which you may be buying these goods, except as otherwise provided in the contract. ACT shall not be liable for any damage or injury to persons or property resulting from improper installation or misuse of any part subject to this warranty.

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