Tomioka Racing 1000HP Rear Axle Kit - 2005-2021 Subaru STI

Tomioka Racing 1000HP Rear Axle Kit - 2005-2021 Subaru STI

On high-powered EJ STI builds, the factory rear axles become a limiting component well before the engine reaches its limits.

Aerospace-Grade Steel Rear Axles Rated to 1000HP

On high-powered EJ STI builds, the factory rear axles become a limiting component well before the engine reaches its limits. Tomioka Racing's 1000HP Rear Axle Kit uses aerospace-grade steel and a 27-spline design for substantially increased torque capacity over the factory axles. ABS-compliant and sold as a pair for the 2005-2021 Subaru STI.

Made to Order

These axles are built to order -- lead time applies. When power levels climb, the rear axles are a predictable failure point on EJ Subarus. The 27-spline aerospace-grade steel construction addresses that limit directly. Correct fitment and installation should be performed by a shop experienced with Subaru drivetrain work.

Key Features

• Rated to 1000 HP/WHP use for serious drag/track builds
• Aerospace--grade steel shafts resist twist and shock loads
• 27--spline teeth for robust engagement
• ABS--compliant design
• Sold as a matched pair (LH + RH)
• Special order item (production lead time applies)

Fitment Notes

• Fits 2005-2021 Subaru STI

Straight From Subispeed

If the build is making power at a level where the factory rear axles are a concern, these are the correct replacement. The aerospace-grade steel and 27-spline design are not marketing language -- they represent a genuine step up in material and geometry from the factory units. Order early given the made-to-order lead time.

What's Included

• 2x Tomioka Racing 1000HP rear axles (pair)
• All mounting hardware

About Tomioka Racing

Tomioka Racing has been engineering bolt-on performance parts for Subaru platforms since 2007, with a design philosophy built around factory-style installation and real-world reliability. Every Tomioka Racing product is engineered to work with the factory setup -- clean installation, correct fitment, and durability under sustained use. For WRX, STI, BRZ, and the 86 platform, Tomioka Racing offers one of the most focused and thoroughly developed bolt-on catalogs available at this price point.