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Chase Bays Power Steering Kit - 04-07 Subaru WRX | STi



The Chase Bays Power Steering Kit for Subaru WRX // STi is designed to eliminate the common factory power steering leaks, fluid spillover, and overheating issues with improved aesthetics, durability, and stealthy design. It is a full 100% upgraded A.N. Hose and Fitting replacement of the stock reservoir and hoses. From the reservoir to pump to rack (and cooler if upgraded). ALL Hose and Hose Ends are BMRS aka Brown and Miller Racing. This is the best Hose/Hose Ends in the world, the same components seen on NASCAR and Indy Car. All the Fitting Adapters are designed and manufactured by Chase Bays to be chassis specific for perfect leak free installs.

Our over-engineered Triple-Baffled Power Steering Reservoir (aeration and spillover proof) is at the core of this kit. Chase Bays only uses the highest quality components available. Our reservoir is constructed of 6061 aluminum and is anodized black with a laser etched cap. The reservoir itself uses our own bracket design to bolt in just like the factory Subaru.

Triple Baffled Power Steering Reservoir
Countless hours of research and development were put into our newest Power Steering Reservoir. This isn’t as simple as putting 2 fittings on a fluid container and calling it a day. It is far more complex. The smaller fitting on the Reservoir is the fluid return from the rack. It can be sent back at pressures up to 120psi. When that hits the fluid in the reservoir it can cause extreme foaming aeration if not properly slowed down and directed. The more the steering and RPM on the car, the higher the pressures will be. This is also what commonly causes the spillover through the cap under heavy use. Most people think their fluid is boiling over when this happens but in most cases it is not…just turbulence.

We have put serious engineering time into the internal design to negate this aeration and spillover entirely. The performance of this Power Steering Reservoir has gotten rave reviews from our customers. In the reservoir photos you can see a "chimney" inside, there is a multi-layer design within this chimney. We can't give away all of our secrets, but just know you won't have any aeration or spillover issues. Between on track testing and computer fluid dynamics, we were able to slow down 120psi to 12psi in 2 inches of fluid motion. That's just 2 of the baffles, it doesn’t end there.

Power Steering is a loop hydraulic system so it needs to be vented. The cap has a unique baffle design to block fluid from pushing out the vent. Go to any road race/drift/rally event and look at all the factory (and most aftermarket) power steering reservoirs. By the end of the day there is spillover all around the reservoir. It was our goal to be the 1 in 100 reservoirs to have no spillover. We are proud to say; that goal has been met.

Hoses and Adapters
The high-pressure rack to pump hose is -6AN stainless steel, Teflon PTFE lined, and black PVC coated. This coating is crucial, it makes the hose resistant to chaffing if it routes against metal or a fellow hose. The -6AN rack to reservoir and -10AN reservoir to pump hoses are abrasion resistant, black nylon sheathed, and SS reinforced. They are all completed with high end black aluminum AN fittings.

We now utilize all AN connections as of early 2022, including the previously clamped on Pump Feed Line to the pump's inlet. This connection now uses our Pump Feed Adapter, which replaces the stock barb fitting with our own o-ring sealing adapter and bracket. This adapter can swivel to be clocked as needed for your application. 

As of now, this Pump Feed Adapter is only known to fit 04-07 Subaru WRX // STI Pumps due to the flange mounting dimensions and internal seal type. If you are unsure about your pump's specific year/make/model/origin, feel free to email before ordering so we can confirm fitment of the kit. 

Genuine Setrab Cooler
An optional GENUINE Setrab power steering oil cooler (13"x3"x2") is offered to those using this kit in harsh conditions. For individual lines or upgrade to cooler for existing kits, click here.

***This kit is designed to be used with 04-07 WRX // STI racks with inlet and outlet (High Pressure and Low Pressure) ports found below subframe itself. If you have a Subaru made before 2004, the subframe will have to be modified to work with our adapters and AN lines for additional clearance. If you are unsure about the fitment, and any possible modifications needed to install the kit, feel free to reach out via email before placing your order.***