SuperPro 2013 Scion FR-S Base Rear Subframe Insert Bushing Kit

Rear Subframe Insert Enhancement Kit for the 2012 Through 2021 Subaru BRZ, Toyota GT86, GR86, and Scion FR-S

The SuperPro SPF3907K is a rear crossmember insert enhancement kit containing four polyurethane bushing inserts engineered for the 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, and 2021 Subaru BRZ, the 2012 through 2020 Toyota GT86, the 2017 through 2020 Toyota 86, the 2022 Toyota GR86, and the 2013 through 2016 Scion FR-S. The SPF3907K insert design does not require removal of the rear subframe to service. Each insert slides into the existing OEM rubber bushing housing after the mounting bolt is removed, stiffening the subframe mount without the labor-intensive subframe drop required for complete bushing replacement. The four SuperPro polyurethane inserts reinforce the original rubber bushings from within, reducing the lateral and longitudinal flex in the rear crossmember that allows the BRZ and GT86 platform rear end to shift under cornering loads. The result is sharper turn-in response, more predictable rear end behavior under load, and reduced NVH from a more rigidly located subframe. SuperPro's engineering-grade polyurethane compound is resistant to heat, oils, and road chemicals, and the SPF3907K carries SuperPro's lifetime warranty on the polyurethane bushing range.

Key Features

• Insert Design Requires No Subframe Removal: The SPF3907K inserts slide into the existing OEM bushing housing one bolt at a time, eliminating the extensive labor required for full bushing replacement on the BRZ and GT86 platform.
• Four Bushing Inserts Included: Complete kit covers all four rear crossmember mounting positions for a full subframe stiffening upgrade in one purchase.
• Reduced Subframe Flex Under Load: Polyurethane inserts eliminate the lateral and longitudinal compliance in the factory rubber mounts that causes rear end movement during cornering and braking.
• Improved Turn-In and Rear End Predictability: A more rigidly located rear crossmember translates to sharper steering response and more consistent rear traction behavior on the BRZ and GT86 chassis.
• SuperPro Polyurethane Compound: Resists degradation from heat, road oils, and weathering that reduces the stiffening effect of rubber inserts over time.
• Lifetime Warranty: SuperPro backs the SPF3907K polyurethane bushing kit with a lifetime warranty against defects in materials and workmanship.

What's Included

• 4 x SuperPro SPF3907K Rear Crossmember Polyurethane Insert Bushings
• SuperPro polyurethane installation grease

Specifications

Fitment

Frequently Asked Questions

1. What is the difference between the SPF3907K insert kit and a full bushing replacement for the BRZ or GT86 rear subframe?
   Full bushing replacement requires dropping the entire rear subframe to press out the factory rubber bushings and press in new ones. The SPF3907K insert kit achieves similar stiffening results without subframe removal. The inserts slide into the existing OEM bushing housing after each mounting bolt is removed, one at a time.
2. Will the SPF3907K make the BRZ or GT86 harsher to drive on the street?
   The insert enhancement design retains the OEM rubber bushing as the primary isolation layer while adding the SuperPro polyurethane insert for stiffness. This preserves a reasonable level of NVH isolation compared to a full rigid bushing replacement, making the SPF3907K appropriate for daily driven BRZ, GT86, GR86, and FR-S vehicles that also see occasional track or canyon use.
3. Does the SPF3907K fit the 2022 and newer GR86 as well as the original GT86?
   Yes. The SPF3907K is fitment-confirmed for the 2022 Toyota GR86 in addition to the original 2012 through 2020 Toyota GT86, the 2012 through 2021 Subaru BRZ, and the 2013 through 2016 Scion FR-S.
4. How do I install the SPF3907K inserts without removing the subframe?
   Remove one rear crossmember mounting bolt at a time. With the bolt removed, the existing OEM rubber bushing housing has enough movement to allow the SPF3907K polyurethane insert to be slid into position inside the factory bushing. Apply the included polyurethane grease to the insert surfaces, seat the insert, and reinstall the mounting bolt. Repeat for each of the four mounting positions.
5. Will I need a wheel alignment after installing the SPF3907K?
   A wheel alignment is recommended after any rear suspension modification on the BRZ and GT86 platform. A four-wheel alignment after installation ensures optimal tire wear and handling balance.
6. Is the SPF3907K appropriate for a BRZ or GT86 that is used for track driving?
   Yes. The SPF3907K is well-suited for street and track dual-use applications on the BRZ, GT86, GR86, and FR-S. The stiffened rear crossmember mounts reduce the chassis flex that can cause inconsistent rear end behavior during repeated hard cornering on track.
7. How many bushings come in the SPF3907K kit?
   The SPF3907K kit contains four polyurethane insert bushings, one for each of the four rear crossmember mounting positions on the BRZ, GT86, GR86, and FR-S platform.
8. Does the SPF3907K also cover the front subframe mounts?
   No. The SPF3907K is specifically engineered for the rear crossmember mounting positions. SuperPro offers separate part numbers for front subframe bushing applications on these vehicles.

Install Instructions

Safely lift and support the vehicle on jack stands with full access to the rear crossmember. Locate the four rear subframe mounting bolts where the crossmember connects to the chassis. Working one bolt at a time, loosen and remove the first mounting bolt. With the bolt removed, the OEM bushing housing will have slight movement. Apply the included SuperPro polyurethane grease to the outside surfaces of the SPF3907K insert bushing. Slide the insert into the OEM rubber bushing housing, orienting it as directed by the SuperPro instruction sheet included in the kit. Reinstall and torque the mounting bolt to factory specification before moving to the next position. Repeat this process for all four mounting positions, completing one at a time to keep the subframe stable throughout the installation. Lower the vehicle and perform a four-wheel alignment before returning the vehicle to normal use.

California Proposition 65 Warning: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, visit www.p65warnings.ca.gov.