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  See more parts for Mazda Miata
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ACT HD/Perf Street Sprung Kit Mazda Miata 2006-2015 - ZM4-HDSS

If you're looking to upgrade your Mazda Miata from 2006 to 2015, the ACT ZM4-HDSS Heavy Duty/Performance Street Sprung Kit is worth a good look. This isn’t just any clutch kit; it's a solid piece of engineering that combines a heavy-duty pressure plate with a street disc that's been proven to perform. Trust me, once you feel the difference, you won’t want to go back.

The pressure plate in this kit uses a unique diaphragm design that boosts clamp load without the excessive deflection you might find in cheaper options. What does that mean for you? Better clutch life and a more reliable performance, especially when you’re pushing your Miata to its limits. Each diaphragm goes through a rigorous four-stage heat-treating process, so you know you’re getting durability that can handle some serious heat.

Now, let’s talk about the performance street disc. It’s crafted from premium organic materials with a high copper content, which helps with heat transfer. Plus, the steel-backed lining gives it extra burst strength. With reduced marcel, you’ll notice quicker shifts, making your driving experience that much more enjoyable. It’s all about that smooth, positive engagement, whether you’re cruising around town or hitting the track.

Here are some features that stand out:

  • Light to moderate pedal effort, so you won’t feel like you’re wrestling with it.
  • Longer friction life thanks to ACT’s exclusive diaphragm design.
  • Carefully engineered and balanced, using premium organic friction materials to handle heat and reduce fade.
  • Perfect for both street driving and racing—this kit doesn’t shy away from a challenge.
  • Every component is clamp load tested and dynamically balanced for reliability at high RPMs.

Specifications you should know:

  • Clutch Disc Diameter: 8.8 inches (224 mm)
  • Input Spline Quantity: 23
  • Input Shaft Diameter: 1 inch
  • Torque Capacity: 281 ft/lbs, which is a nice bump over OE specs.
  • Product Weight: 13.4 lbs—light enough to keep things nimble.

This kit is designed specifically for 6-speed applications, and yes, it comes with pressure plate bolts (M8-1.25 x 20mm) included, so you won’t have to hunt for them. Just keep in mind that the clutch master cylinder and slave cylinder aren’t included, but you’ll get grease and an alignment tool, which is a nice touch.

In short, if you want a clutch that’s built to last and can handle both daily driving and spirited weekend runs, the ACT ZM4-HDSS kit is a solid choice. Your Miata will thank you.

Other Part Numbers:
ACT #actZM4-HDSS

Proposition 65

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

Vehicle
2006-2015
 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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