PERRIN 08-21 Subaru WRX / 09-21 STI / 13-25 BRZ & GR86 / 10-14 LGT FXT Rear Endlinks (Poly)

Solid Polyurethane Rear Endlinks Built to Outlast OEM Hardware on Your Subaru or Toyota

The PERRIN PSP-SUS-237 rear endlinks replace the factory plastic-and-rubber endlinks that are a well-documented weak point on the Subaru WRX, WRX STI, BRZ, Toyota GR86, Subaru Legacy GT, and Subaru Forester XT. The PSP-SUS-237 connects the rear sway bar to the chassis with a rigid polyurethane bushing pressed into a 6061-T6 aluminum arm, eliminating the bushing flex that makes aftermarket sway bars feel soft and imprecise. The result is sharper turn-in, reduced body roll, and a more direct transfer of sway-bar forces to the suspension geometry.

Features

• 95a durometer polyurethane bushings for a firm, near-spherical feel without the harshness or noise of metal rod ends
• 6061-T6 billet aluminum endlink arms, CNC-machined and black-anodized for corrosion resistance
• Grade 8 bolts included with high-corrosion-resistant nuts, washers, and spacers
• Fixed length, non-adjustable design for direct bolt-on fitment with no modifications required
• Sold as a pair (2 endlinks) covering both driver and passenger sides
• Black anodized finish matches most Subaru underbody hardware
• Polyurethane is nearly maintenance-free and rated for track and daily-driver use

Fitment

Specifications

What's Included

• 2 x PERRIN PSP-SUS-237 polyurethane rear endlinks (one driver side, one passenger side)
• Grade 8 mounting bolts
• High-corrosion-resistant nuts
• Washers and spacers for correct alignment
• Installation instructions

Frequently Asked Questions

Are the PSP-SUS-237 endlinks adjustable in length?

No. The PSP-SUS-237 is a fixed-length endlink designed for direct OEM replacement. The fixed geometry ensures proper bushing alignment and eliminates the need for setup adjustments during installation. If you need adjustable endlinks for corner-balancing or ride-height changes, PERRIN also offers the PSP-SUS-235 spherical bearing endlinks with adjustable length.

What is the difference between PERRIN polyurethane endlinks and OEM rubber endlinks?

OEM endlinks use rubber bushings that deflect under load, partially absorbing sway-bar input before it reaches the suspension. This deflection dulls turn-in response and allows the sway bar to twist under high cornering loads. The PSP-SUS-237 uses 95a durometer polyurethane bushings pressed into 6061-T6 aluminum arms. The stiffer bushing compound transfers sway-bar forces more directly to the chassis, improving cornering flatness and feel without the noise or maintenance that comes with solid spherical bearings.

Do the PSP-SUS-237 endlinks fit the 2022+ Subaru BRZ and Toyota GR86?

Yes. The PSP-SUS-237 is confirmed to fit both the 2022-2025 Subaru BRZ and the 2022-2025 Toyota GR86. These second-generation ZD8 and ZN8 platforms share rear suspension geometry with the earlier ZC6 BRZ and ZN6 86/FR-S, so the PERRIN endlink is a direct fit across all generations.

Will the PSP-SUS-237 fit the Subaru WRX STI?

Yes. The PSP-SUS-237 fits the 2009-2021 Subaru WRX STI. The STI shares the same rear suspension mounting points as the WRX for these model years, so no adapters or modifications are needed.

Do I need to upgrade my sway bar to use these endlinks?

No. The PSP-SUS-237 endlinks work with the factory OEM rear sway bar as well as any aftermarket rear sway bar. Many owners install them alongside the factory bar as a preemptive upgrade, since OEM endlinks are a known failure point when a larger-diameter aftermarket sway bar increases the forces on the endlink bushings.

Will installing PERRIN endlinks void my Subaru factory warranty?

Under the Magnuson-Moss Warranty Act, an aftermarket part cannot void your factory warranty unless the manufacturer can prove the part directly caused the failure in question. Installing the PSP-SUS-237 rear endlinks does not automatically void your Subaru powertrain or vehicle warranty. If you have concerns about specific warranty terms at your dealership, review your warranty documentation before installation.

Are the PSP-SUS-237 endlinks noisy on rough roads or daily driving?

No, polyurethane bushings are substantially quieter than spherical bearings or heim joints. The 95a durometer compound provides enough compliance to absorb minor road noise and vibration without the clunking that metal-on-metal spherical bearings can develop over time. PERRIN specifically chose this durometer to replicate the feel of spherical bearings while keeping the endlink suitable for daily driving and track use.

What tools do I need to install the PSP-SUS-237 rear endlinks?

Installation requires basic hand tools: a floor jack and jack stands or a vehicle lift, a 14mm and 17mm socket (or open-end wrench), a torque wrench, and anti-seize or assembly lubricant for the bushing contact surfaces. No specialized suspension tools or alignment equipment are required for the endlink swap itself, though a wheel alignment is recommended any time rear suspension components are replaced.

Installation Instructions

1. Raise the vehicle and secure it on jack stands or a lift. Never work under a vehicle supported only by a floor jack.
2. Locate the rear sway bar and trace the endlinks from the sway bar ends down to the lower control arm or chassis mounting point on each side.
3. Using a 14mm or 17mm socket, hold the endlink body steady and break loose the upper mounting bolt at the sway bar end.
4. Remove the upper bolt, washer, and spacer from the sway bar mount. Keep all OEM hardware together for reference.
5. Break loose and remove the lower mounting bolt at the control arm or trailing arm bracket, again retaining the OEM hardware.
6. Slide the factory endlink free from both mounting points. Inspect the sway bar bushing brackets and mounting holes for wear or corrosion. Clean the threads with a wire brush if needed.
7. Unpack the PSP-SUS-237 endlinks and identify which spacers and washers are included. The kit includes Grade 8 bolts, corrosion-resistant nuts, and spacers for correct bushing alignment.
8. Apply a thin coat of assembly lubricant or supplied grease to the polyurethane bushing contact surfaces on each endlink before installation to prevent premature wear and squeaking.
9. Position the PERRIN endlink at the upper sway bar mounting point. Insert the Grade 8 bolt through the sway bar eye, the endlink bushing, and the appropriate spacers in the order shown in the PERRIN instructions. Thread the nut finger-tight.
10. Route the lower end of the endlink to the control arm mounting point and install the lower bolt, washer, spacer, and nut in the same manner. Thread finger-tight to allow final alignment.
11. With both mounting points threaded, position the endlink perpendicular to the ground (not angled). Adjust spacers as needed so the bushing sits flat and square at both ends.
12. Torque the upper and lower mounting bolts to the specification in the included PERRIN instructions. Typical rear endlink torque specs for this application are 30 to 40 ft-lbs, but always confirm against the included sheet.
13. Repeat steps 7 through 12 for the opposite side.
14. Lower the vehicle and perform a visual inspection from behind to confirm both endlinks are seated correctly and hardware is fully torqued.
15. Drive the vehicle for 50 to 100 miles, then re-check all torques. A wheel alignment is recommended after any rear suspension component replacement.

WARNING: This product can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and reproductive harm. For more information go to www.P65Warnings.ca.gov.