Subaru WRX STi Bushing Kit - Rear - Kartboy - Soft - `04-`07. This Kartboy soft rear differential bushing kit is a direct-fit replacement designed for 2004–2007 Subaru WRX STI owners who want firmer control of rear differential movement without harshness.

Made by Kartboy and built from a soft durometer polyurethane, this kit restores support lost to aged factory rubber bushings while keeping NVH (noise, vibration, harshness) comfortable for daily driving. The bushings help limit unwanted rear differential shift under acceleration and cornering, which can improve drivetrain feedback and overall consistency during spirited driving. This kit is intended as a durable, long-lasting replacement that resists oils and road contaminants better than old rubber components. Always confirm fitment for your specific chassis and model year before ordering.

Features

• Soft durometer polyurethane compound for controlled compliance
• Direct-fit design for 2004–2007 Subaru WRX STI (verify fitment)
• Helps reduce differential movement and drivetrain slop
• More resistant to oil and road contaminants than aged rubber
• Manufactured by Kartboy, a well-known Subaru specialist

If you have questions or want help confirming fitment, call us directly — we’re happy to assist. We offer installation and customization services at our two locations in Austin, Texas and the Los Angeles, California area. 512-982-9393 (TX) | 562-981-6800 (CA). If you are considering purchasing multiple items, please contact us for shipping discounts. We install on premises at both locations.

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov