Driveshaft Shop Direct Bolt-In 800HP Rear Axle | 2004-2007 Subaru WRX STI (RA8528X4)

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2004-2007 Subaru WRX STI Direct Bolt-In 800HP Rear Axle by Driveshaft Shop

Its been a long time coming for this axle. When the STi came out, many had surpassed the 600HP mark and we went right from the axle bar upgrades using the factory CV’s to the level 4 Axle and Hub kits. Some time has passed and the cars are starting to get older, and most builds are under 800HP so we decided to make a direct bolt in axle that will support 500WHP.

This is similar to our Level 5 axle except the outer CV is made from Billet Chromoly and the internals are also made from the same high grade material, while using the original spline size to fit the stock hubs. To make sure the center bar was up to the task of hard launches, autocross and rally demands, we have decided to use the new 300M material we have been getting directly from the mill in Sweden (*Ovar). This material has proven to be without a doubt the strongest and most resilient bar material we have used to date. Also we have recently changed the inner CV from a tripod design to a full ball and cage design with a larger radius to the spline plug for added strength. So there you have it, a direct fit axle that will with stand the most violent launches, time attack or rally applications (ask about the road rally package that uses a ultra high grade grease and vented boots).

Please Note: Sold individually.


  • Uses the new 300M material
  • The strongest and most resilient bar material
  • A direct fit axle that will with stand the most violent launches, time attack or rally applications


  • 2004-2007 Subaru WRX STi

What's In The Box?

  • 1 - Rear Axle


  • Manufacturer Standard Warranty

Customer Reviews

Based on 1 review
Dss 800 hp rear axles

Awesome axles.....but beware as the outboard spline shaft is too long so requires removal of center caps and use loctite. Also 562 miles in 3 out of 4 boots ripped and dss refused to warranty me atleast new boots. I will buy a different set of axles next time around.