Kartboy KB-9000 Short Shifter and Bushing Combo Kit

The Kartboy KB-9000 is a complete short shifter and polyurethane bushing combo kit engineered to eliminate sloppy, vague shifts and restore a crisp, precise feel to the manual transmission. This all-in-one kit replaces both the factory shifter lever and the worn rubber mount bushings in a single purchase, saving time and money over sourcing components separately.

The included short throw shifter is CNC-machined and TIG-welded from 4130 chromoly steel for maximum strength and durability. Shift throw is reduced by up to 40% and the shift knob height is lowered by 1 inch for a sportier, more ergonomic driving position. The factory reverse lockout is fully retained.

The front and rear high-durometer polyurethane bushings replace the soft OEM rubber units underneath the vehicle, eliminating unwanted flex in both the front-to-back and side-to-side directions. The result is a shifter that feels dramatically more solid and direct without opening up the transmission. Bushings are handmade in the USA and backed by a lifetime guarantee.

Kit Includes:

• Kartboy Short Throw Shifter — KB-20-STI
• Kartboy Front Shifter Bushings — KB-003-STI
• Kartboy Rear Shifter Bushing — KB-003-REAR

Key Features:

• Reduces shift throw by up to 40% for faster, more confident gear changes
• Shift knob height lowered by 1 inch for improved ergonomics
• CNC-machined and TIG-welded 4130 chromoly steel construction
• High-durometer polyurethane bushings eliminate front-to-back and side-to-side slop
• Retains OEM reverse lockout functionality
• Bushings handmade in the USA — 100% guaranteed
• Installs with basic hand tools in approximately 30 minutes
• Backed by Kartboy's lifetime warranty

The KB-9000 combo kit is one of the most impactful drivetrain upgrades available for the Subaru STI, equally at home on a street build or a dedicated track car.