SuperPro Rear Differential Carrier Outrigger Mount Bushing Set Subaru WRX / STI 2002-2007 | SPF4350K

Product Fitment:

2002-2007 Subaru WRX

2004-2007 Subaru STI

Strengthen your suspension’s backbone with the SuperPro SPF4350K Rear Subframe-to-Body Mount Bushing Kit — a direct-fit upgrade that replaces aging, soft rubber bushings typically used in factory subframe mounts. Over time, stock rubber mounts degrade, allowing unwanted subframe movement that compromises handling, traction, and ride stability.

Made from SuperPro’s proprietary polyurethane elastomer, SPF4350K significantly reduces subframe flex under acceleration, braking, and cornering loads — giving you a firmer, more stable chassis connection. With tighter rear-end mounting you’ll benefit from improved handling precision, reduced drivetrain shift or “walk,” and better rear-end control under load. The material resists wear, oil, water, and extreme temperatures, delivering consistent performance over a long lifespan.

When installed properly (approx. 3-hour job, rear position), SPF4350K helps restore steering geometry, improve traction and tire wear, and provide a more connected road feel — whether you’re daily driving, hauling, or pushing your car hard.

Kit Contents & Specs:

• Polyurethane bushings (2 shell-type bushings)

• 2 steel tubes / sleeves

• 2 washers — everything needed to replace the worn subframe-to-body bushings

• Warranty: Lifetime guarantee against defects