SKU: BCB-4297K | UPC: 700424681044
Cobb 08-21 Subaru WRX & STI/2018 Type RA/2019 S209 Rear Differential Subframe Mount Bushing Inserts
Cobb Rear Differential Subframe Mount Bushing Inserts replace soft OEM rubber in the rear subframe mounts on 2008-2021 Subaru WRX and STI models, including 2018 Type RA and 2019 S209. Crafted from 95A durometer polyurethane, these inserts minimize bushing deflection to deliver precise power transfer, reduced wheel hop, and enhanced cornering stability. Drivers experience tighter chassis response and consistent launches without excessive noise or harshness.
Key Features
- 95A Durometer Polyurethane: Provides firm support to eliminate slop while retaining compliance for street drivability and track performance.
- Direct Insert Design: Fits inside existing OEM metal shells for simple replacement without full bushing removal or pressing.
- Reduced Wheel Hop: Locks the differential subframe to improve traction during hard acceleration and gear shifts.
- Enhanced Handling Precision: Minimizes rear-end movement for better turn-in and stability under load.
- Durability: Resists heat, ozone, and chemicals far better than stock rubber for long-term reliability.
Product Notes
- Reuse OEM outer shells; inserts install with basic hand tools in about 30-45 minutes.
- Compatible with stock and aftermarket differentials; no alignment required post-install.
- Small package ships compactly; handles standard ground shipping without issues.
Installation Notes
- Professional installation recommended.
- Jack up rear of vehicle and support subframe; torque bolts to 59 ft-lbs after insert placement.
- Includes grease for assembly; uses OEM hardware with no modifications needed.
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2008-2014 | Subaru | Impreza WRX | |
| 2008-2021 | Subaru | Impreza WRX STI | |
| 2015-2021 | Subaru | WRX | |
| 2018 | Subaru | WRX STI | Type RA |
| 2019 | Subaru | WRX STI | S209 |
Why Choose Cobb?
- Subaru specialists with decades of platform-specific development.
- Manufactured in USA with rigorous quality testing.
- Engineered for direct fit and real-world performance gains.
Frequently Asked Questions
- Q: Will this fit my 2021 WRX STI?
A: Yes, direct fit for all 2008-2021 WRX/STI chassis including STI models; confirm submodel via VIN if modified. - Q: What material are the inserts made from?
A: High-quality 95A durometer polyurethane, tougher than OEM rubber with better resistance to degradation. - Q: What is the warranty and install difficulty?
A: Cobb offers a 1-year warranty; DIY-friendly bolt-on install takes under 1 hour with jack stands and basic tools.
Shipping & Handling
- Method: UPS Ground or USPS Priority
- Availability: In stock – ships same or next business day
- Packaging: Compact box measuring 6″ x 4″ x 2″
- Weight: 0.81 lbs (shipping)
