Fitment Information

• Subaru WRX STI / WRX Hatch (2008, 2009, 2010, 2011, 2012, 2013, 2014)
  
• Subaru WRX STI Sedan (2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018)
  
• Subaru WRX STI Type RA Sedan (2018)
  
• Subaru WRX STI S209 Sedan (2019)
  
• Subaru WRX Sedan (2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018)
  • Fits Manual Transmission Only
• Subaru WRX Hatch (2008)
  
• Subaru WRX Sedan (2008, 2015, 2016, 2017, 2018)
  
  • Fits Automatic Transmission Only
    

Specs & Features

• Eliminate the Clunk: Specifically targets the Rear Differential Support Mounts (often called the "outrigger" or rear diff ears) to stop the diff from slamming against the subframe during hard shifts.
• Instant Power Transfer: By filling the voids in the soft factory rubber with 85a Durometer Polyurethane, you reduce "torque twist" and ensure your engine's energy goes straight to the wheels.
• Built to Last: Our proprietary polyurethane blend is completely Unaffected by Road Grime, Oil, or Salt, meaning it won't degrade, crack, or turn mushy like OEM rubber eventually does.
• Daily Driver Approved: Engineered to be the "Goldilocks" of mounts—stiff enough for track use but formulated with a special blend to minimize NVH (Noise, Vibration, Harshness) inside the cabin.
• Sharper Handling: A stable differential means a stable rear end. Tightening up these mounts helps the car feel more predictable and planted when powering out of corners.

Product Description

If you own a Subaru, you probably know the feeling: you go for a quick 1-2 shift, and you hear a distinct "thud" from the back of the car. That is your rear differential twisting on its soft, marshmallow-like factory mounts. The Rear Differential-to-Subframe Bushing Kit (Rear Support) is the definitive fix for this sloppy behavior. By reinforcing the rear mounting points of the differential, we stop that violent movement before it starts.

Factory rubber mounts are designed for grandma's grocery runs, not for enthusiasts. They have empty voids that allow the diff to bounce around. This kit uses specially formulated 85a Polyurethane inserts to fill those gaps and lock the differential securely to the subframe. The result? When you step on the gas, the car just goes. No delay, no clunk, just immediate forward motion.

You could weld the diff to the frame, but your teeth would rattle out. The magic of this kit lies in the material. We use a proprietary polyurethane formula that is tough as nails but still has enough damping characteristics to absorb high-frequency road noise. It effectively bridges the gap between a sloppy stock car and a harsh race car, giving you the best of both worlds: performance you can feel, with comfort you can live with.

This is one of the most rewarding "bang for your buck" modifications you can do to a Subaru chassis. It protects your drivetrain from shock, cleans up your shifting feel, and makes the car feel years newer. Don't let your torque get lost in the rubber—tighten it up and enjoy the drive.