ACT 1991 Mazda Miata XT/Race Sprung 6 Pad Clutch Kit
A turbocharged or supercharged NA or NB Miata can overwhelm the factory clutch quickly: it slips in third on boost, smells hot after a track session, or lets the rpm flare on every hard shift. ACT ZM2-XTG6 pairs ACT's Xtreme pressure plate with a 6-pad sprung ceramic race disc for Miatas making serious power, where holding torque matters more than a soft pedal.
The Miata uses a single-plate clutch bolted to a flywheel on the back of the B-series four-cylinder. ACT rates ZM2-XTG6 at 405 ft-lb of torque capacity measured at the crank, 126 percent over the factory clutch. The disc is 224 mm (8.8 in) with ceramic pads and a 0.9375 in input shaft size. ACT's Xtreme diaphragm raises clamp load and reduces deflection, and the spring-centered hub damps driveline vibration so the disc survives harsh use.
ACT is direct about the trade-offs: moderate to heavy pedal effort, aggressive engagement, OE to mild gear rattle and moderate friction life. ACT expects pedal effort to rise 50 to 80 percent with an Xtreme plate depending on the car. This is a high-horsepower street or race clutch, not a stock replacement.
Do a slip test in a high gear at low rpm with full throttle and watch whether engine speed outruns road speed. Check the clutch hydraulics too, since a tired master or slave cylinder causes poor release and grinding that can be mistaken for clutch wear. Our slipping diagnosis guide covers the road test. If your car is stock or near stock, ACT's milder XT Perf Street sprung kit or the HD Race sprung 6-pad kit may be the better fit.
Our title says 1991, but ACT lists ZM2-XTG6 across the NA and NB Miata: 1990-1993 with the 1.6L and 1994-2005 with the 1.8L, including the 2004-2005 Mazdaspeed Miata. The 1.6L cars left the factory with a smaller clutch, and our ACT flywheel listings note that 1990-1993 cars must use the 1.8L-size clutch with those flywheels. On an early car, plan this kit together with a 1.8L-pattern flywheel and confirm before ordering. It does not fit the 2006-up NC or later cars. Match part number ZM2-XTG6, and send us the year and VIN if you are unsure what flywheel is fitted.
No flywheel is included.
Weighing a clutch job against other drivetrain work? See our repair cost guide.
| Brand | ACT |
| Part number | ZM2-XTG6 |
| Fits | ACT 1991 Mazda Miata XT/Race Sprung 6 Pad Clutch Kit |
| Vehicle fitment | Mazda Miata Xt/Race Sprung 6 (1991) |
| Type | Clutch Kits - Single |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
Yes. ACT lists ZM2-XTG6 for 1994-2005 Miatas with the 1.8L, including the Mazdaspeed, and for 1990-1993 1.6L cars. It does not fit the 2006-up NC.
ACT lists the early cars, but they originally used a smaller clutch. Plan to run it with a flywheel made for the 1.8L-size clutch, such as ACT's Miata Prolite or Streetlite, and confirm with us before ordering.
ACT describes it as moderate to heavy and expects an Xtreme pressure plate to add roughly 50 to 80 percent pedal effort depending on the car.
Usually not. The 6-pad sprung race disc engages aggressively and ACT recommends it for high horsepower street or race use. Stock cars are better served by a street disc.
No. The kit includes the pressure plate, disc, release bearing, pilot bearing and alignment tool.
ACT rates ZM2-XTG6 at 405 ft-lb measured at the crank, 126 percent over the factory clutch.
