XClutch 18-21 Subaru WRX Base 2.0L 10.5in Twin Sprung Organic Clutch Kit

The 2.0L turbocharged WRX responds to a tune and bolt-ons faster than its clutch can keep up. Owners who add an intake, downpipe and a pro tune commonly find that the factory clutch starts slipping at peak torque in third and fourth, then begins to chatter and smell after repeated launches. XClutch XKSU23525-2A is a twin-disc kit for the 2018-2021 Subaru WRX 2.0L six-speed manual, aimed at drivers who want to hold that extra torque while still driving the car to work.

How the twin-disc design works in a WRX

Instead of a single disc squeezed by a very stiff pressure plate, this kit uses two friction discs separated by a floater plate. Twice the friction surfaces means far more torque capacity at a given clamp load, so the pedal stays reasonable. XClutch fits this kit with organic friction on sprung hubs. Organic material engages progressively, and the hub springs absorb driveline shock on launches and fast shifts, which helps protect the gearbox and the rest of the all-wheel-drive driveline. The kit comes with its own chromoly flywheel with a lightweight alloy hat, so the factory flywheel is replaced as part of the package rather than resurfaced.

The product name says 10.5in, but the manufacturer's spec lists the friction disc diameter as 9-1/16 inch, part of XClutch's 9-inch twin range. The BRZ version of this XClutch twin and the 2015-2021 WRX STI kit come from the same family but are not interchangeable with this one.

Symptoms that mean the WRX clutch is done

• Revs rising without acceleration under boost, worst in third and fourth
• Engagement point high on the pedal, or a pedal that engages differently cold and hot
• Shudder pulling away on an incline
• Burnt friction smell after spirited driving
• Squeal or growl that changes with pedal position, usually the release bearing

How to confirm before you buy

Hold fourth gear from around 2,500 rpm at full throttle: if the tach jumps ahead of speed, the clutch is slipping. Logging the run with your tuning software shows it clearly as engine speed rising faster than vehicle speed. Rule out hydraulics first by checking the reservoir level and bleeding the line, since a soft or sinking pedal causes drag that feels like a worn clutch. If your car is near stock power, a single disc like the ACT HD performance street kit may be all it needs. For a sense of shop labor on a clutch job, see our manual transmission repair cost guide.

Fitment

This listing is for the 2018-2021 Subaru WRX 2.0L turbo with the six-speed manual. XClutch's application data lists the Base trim for 2018-2024 and the Premium and Limited trims through 2025, but our listing is titled 2018-2021 and that is the range we stand behind. It does not fit the WRX STI with the 2.5L or the CVT-equipped WRX. If you have a 2022-later car or are not sure what is in yours, send us the year and VIN before ordering.

What is in the box and install notes

XClutch lists the contents as friction discs, pressure plate, release bearing, flywheel, pilot bearing, aligning tool and technical service bulletins. Published specs give a +0.150 inch flywheel step and a 1 inch, 24-spline input. On install:

• Read the service bulletins in the box before you start; they cover disc orientation and break-in.
• Center the discs with the supplied aligning tool and torque the pressure plate bolts in a star pattern to the kit figure.
• Fit the new pilot and release bearings, and check the rear main seal and fork pivot while you are in there.
• Bleed the clutch hydraulics and confirm full release before driving.
• Expect some idle rattle with the pedal out; that is normal for twin-disc clutches.

If you want a different twin-disc feel, the ACT Mod-Twin HD sprung street kit is another option worth comparing.

Will XKSU23525-2A fit my 2022 or newer WRX?

XClutch's own application rows extend past 2021 for some trims, but our listing is sold as a 2018-2021 part. Send your year and VIN and we will check it against the current application before shipping.

Does it fit the WRX STI?

No. The STI uses a 2.5L engine and a different gearbox. XClutch makes a separate kit for the 2015-2021 STI, which we also carry.

Is a flywheel included?

Yes. XClutch lists a chromoly flywheel with a lightweight alloy hat in the kit, along with the discs, pressure plate, release bearing, pilot bearing and aligning tool.

How hard is the pedal compared to stock?

The twin-disc layout gets its torque capacity from extra friction surfaces rather than a very stiff spring, so the pedal is far more livable than a big single-disc race clutch. Expect it to be firmer than stock, not punishing.

Is there a break-in period?

Yes. Follow the break-in in the kit bulletins: normal street driving with no launches or full-boost pulls until the friction surfaces bed in.

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