ACT 07-13 Mazdaspeed 3 / 06-07 Mazdaspeed 6 XT/Race Sprung 6 Pad Clutch Kit
The ACT ZX4-XTG6 is the strongest single-disc ACT kit for the 2.3L turbo Mazdaspeed cars: an Xtreme pressure plate, a 6-pad sprung ceramic race disc and a lightweight XACT Prolite flywheel. It covers the 2007-2013 Mazdaspeed3 and the 2006-2007 Mazdaspeed6. Owners usually land here after a tune, turbo or fuel upgrade leaves the stock clutch slipping as boost builds, or after a lighter kit has already given up at the drag strip.
Both cars use the turbocharged 2.3L direct-injection four-cylinder with a six-speed manual, and the Mazdaspeed3 sends all of its torque through the front wheels. ACT rates this kit at 681 ft-lb at the crank, 129 percent over the factory clutch, using a 240mm (9.4 in) ceramic disc on a 1-inch input shaft. Kit weight is 32.5 lb.
It is a conversion kit, and the included flywheel is what sets the ZX4 kits apart from ACT's ZX5 line. ZX4 kits ship with the 600521 Prolite flywheel, ACT's lighter option, so the engine revs up and drops faster between shifts. The ZX5 kits use the heavier Streetlite flywheel, which is easier to launch and drive in traffic. With the Xtreme plate, ACT describes moderate to heavy pedal effort and aggressive engagement.
Kit contents per ACT: 600521 Prolite flywheel, MZ031X Xtreme pressure plate, 6240508-2 6-pad sprung race disc, RB110 release bearing, PB1030 pilot bearing and AT03 alignment tool, plus M8-1.25 x 16mm plate bolts.
From low rpm in fourth gear, go wide open and watch the tach: a slipping clutch lets rpm climb ahead of road speed as boost arrives. Our slipping diagnosis guide covers the test, and the flare vs. slip guide helps separate clutch slip from other issues. Check that the clutch hydraulics release and return properly, and look for oil at the bellhousing. Oil from the rear main seal will contaminate any new disc.
ACT lists the ZX4-XTG6 for the 2007 through 2013 Mazda3 Mazdaspeed 2.3L turbo, and the 2006 and 2007 Mazda6 Mazdaspeed 2.3L turbo. It does not fit the non-turbo Mazda3 or Mazda6. If your car has had a transmission swap or you are unsure which clutch is in it, send us the year and VIN before ordering. You can browse other clutch kits, flywheels and plates in our rebuild kits and clutch section.
A lighter flywheel and 6-pad disc make the car less forgiving at low rpm. For a lighter pedal with the same disc style, see the ZX4-HDG6, or for street manners the ZX5-XTSS street kit.
| Brand | ACT |
| Part number | ZX4-XTG6 |
| Fits | ACT 07-13 Mazdaspeed 3 / 06-07 Mazdaspeed 6 XT/Race Sprung 6 Pad Clutch Kit |
| Vehicle fitment | Mazda Mazdaspeed (2007-2013) |
| Type | Clutch Kits - Single |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
ACT lists the 2007-2013 Mazdaspeed3 and the 2006-2007 Mazdaspeed6, both with the 2.3L turbo. It does not fit non-turbo Mazda3 or Mazda6 models.
The flywheel. ZX4 kits include ACT's lighter 600521 Prolite flywheel; ZX5 kits use the heavier Streetlite flywheel, which is easier for launching and stop-and-go driving.
ACT rates the ZX4-XTG6 at 681 ft-lb measured at the crank, 129 percent over the factory clutch.
No. It is a conversion kit and the Prolite flywheel is included, along with the pressure plate, disc, release bearing, pilot bearing, alignment tool and plate bolts.
It can be driven daily, but ACT describes moderate to heavy pedal effort and aggressive engagement, and the light flywheel makes pulling away less forgiving. A street disc kit suits a commuter better.
