Whiteline Rear Differential Mount Inserts Positive Power Kit – 08-14 Subaru WRX Hatch / 08-09 Subaru STI

Whiteline KDT903 provides rear differential mount inserts positive power kit for 08-14 Subaru WRX Hatch / 08-09 Subaru STI.

How It Works

Differential inserts supplement the existing mounting bushings to limit movement under changes in driveline load. They retain part of the original mounting system rather than replacing every bushing. A more direct mounting response can change how acceleration and lift-off transitions feel, but it does not increase engine output.

Key Specifications

• Manufacturer part number: KDT903
• Position: Rear
• Design: Supplements the voids in the existing mounting bushing

Installation & Selection

Inspect the original differential bushings and mounting hardware first; inserts are not a repair for torn or separated mounts. Check orientation and clearance during installation. Increasing mount stiffness can transmit more driveline noise or vibration, so consider the response/refinement balance for street and track use.

Vehicle Fitment