Driveshaft Shop 510215 800HP Direct Bolt-In Rear Axle Pair for 04-07 Subaru STI

Vehicle Fitment

• 2004-2007 Subaru Impreza WRX STI

Fitment Notes

• Rear axle application
• STI only -- does not fit base WRX models
• Sold individually -- order 2 for a complete pair (left and right), or 1 to replace a single side
• Uses factory spline size to fit stock hubs
• Direct bolt-in, no modification required

Features

• Rated for up to 800 whp
• Billet Chromoly outer CV joint
• Billet Chromoly internal components
• 300M center bar material
• Built for hard launches, autocross, and rally use
• Retains original factory spline size
• Simpler, lower-cost alternative to a full axle/hub kit for sub-800HP builds

Specifications

• Power rating: 800 HP
• Position: Rear
• Outer CV material: Billet Chromoly
• Center bar material: 300M
• Spline: Factory OEM size

Included Components

• 1x Rear axle

Product Description

The Driveshaft Shop 510215 is an 800HP direct bolt-in rear axle engineered specifically for the 2004-2007 Subaru STI, built for owners whose builds have outgrown the factory CV axles but don't need the full complexity of a Level 5 axle and hub kit. As STI power levels climbed past 600whp over the years, Driveshaft Shop developed this direct bolt-in axle to support up to 800whp while retaining the stock hub and spline size for a straightforward installation.

The outer CV joint and internal components are machined from Billet Chromoly for serious strength under repeated hard use, while the center bar uses 300M material -- the same high-grade alloy trusted to handle the demands of hard launches, autocross, and rally driving without twisting or failing. This construction gives STI owners genuine confidence at power levels that would quickly destroy a factory axle.

Sold individually, this axle is a direct bolt-in replacement requiring no modification to install -- order 2 to complete a full rear axle pair, or 1 to replace a single damaged side. Built specifically for the STI -- not compatible with base WRX models, which use different Driveshaft Shop part numbers -- this axle is the right choice for STI owners pushing serious power who need a proven, durable upgrade without the cost of a complete axle/hub system.