The Racer X Fabrication thermostatic oil adapter plate kit for the 2004+ Subaru WRX / STI is available as a separate kit for those that would like to build their own oil cooler kit.
Construction
The adapter plate and spacer are CNC machined from 6061-T6 aluminum. The thermostatic adapter plate and the spacer use a square profile O-ring for a perfect seal to the OEM oil filter location. The thermostatic adapter plate uses a 185F thermostat that allows oil temperatures to raise to operating range before diverting oil through the cooler. The adapter plate comes standard in black anodize.