Kartboy KB-003-DIFF-S Soft Rear Differential Bushing Kit for 2002–2007 Subaru WRX and 2004–2007 WRX STI

Kartboy 02-07 Subaru WRX/04-07 Subaru WRX STi Rear Differential Bushing Kit - Soft

Upgrade the rear differential mounting system of your Subaru with the Kartboy KB-003-DIFF-S Soft Rear Differential Bushing Kit. Designed for 2002–2007 Subaru WRX and 2004–2007 Subaru WRX STI models, this kit helps reduce unwanted differential movement while retaining a more compliant ride than a firmer bushing setup.

The Kartboy KB-003-DIFF-S is engineered to improve drivetrain stability during acceleration, shifting, and cornering. By limiting excessive rear differential movement, the bushings can help create more consistent power delivery and reduce drivetrain shock. The soft compound is well suited for street-driven vehicles and enthusiasts seeking improved response without introducing the harsher feel associated with rigid motorsport-oriented bushings.

This automotive replacement and performance upgrade is intended for installation in the factory rear differential mounting location. Confirm vehicle application and existing hardware condition before installation. Professional installation is recommended for proper fitment, torque application, and inspection of related drivetrain components. The kit is sold as one set and is supplied by Kartboy under part number KB-003-DIFF-S.

Fitment: 2002–2007 Subaru WRX; 2004–2007 Subaru WRX STI. Fitment data should be verified against the vehicle model, year, drivetrain configuration, and existing differential hardware before ordering.

What's Included: Kartboy KB-003-DIFF-S soft rear differential bushing kit.

Features:

• Soft bushing compound helps reduce rear differential movement while maintaining a street-friendly level of ride compliance.
• Improves drivetrain stability during acceleration, shifting, and cornering.
• Helps promote more consistent power transfer by limiting unwanted differential deflection.
• Designed as a direct-fit rear differential bushing upgrade for select Subaru WRX and WRX STI applications.

Air Freight Prohibited: false
Not Carb Approved: false
Ltl Freight Required: false
Prop 65: Unknown
Part Type: automotive
Epa: N/A
Carb Acknowledgement Required: false
Regular Stock: t
Units Per Sku: 1