Whether you have a rally-inspired WRX or a built STI, maintaining ideal oil temperatures is necessary for both optimal performance and engine longevity. Treat your flat-four to a dose of reliability with the Mishimoto Subaru WRX/STI Direct-Fit Oil Cooler Kit. This kit includes precision engineered application-specific mounting brackets, premade stainless steel braided oil lines, a billet oil sandwich plate, an efficient 10-row stacked-plate Mishimoto oil cooler, and all necessary hardware. This kit provides .5 qt of additional oil capacity and reduces temperatures by more than 20°F (16°C) while providing minimal pressure loss. This kit is available with the Mishimoto standard Oil Sandwich Plate or the Mishimoto Oil Sandwich Plate with Rear-Mounted Thermostat for additional oil temperature control and optimal performance in any environment. For additional customization this kit is available with your choice of either a Sleek Silver or Stealth Black cooler. This kit is the perfect complement to the Mishimoto Subaru WRX/STI Performance Aluminum Radiator, Performance Aluminum Fan Shroud Kit, and Silicone Radiator Hose Kit for the ultimate cooling solution for your Subaru. As with all our products, this kit includes the Mishimoto Lifetime Warranty.Direct fit for the 2001-2005 Subaru WRX and STIIncrease in Oil Capacity: 0.5 qt / Temperature Difference: 20+°F / Pressure Drop: 1-2 psiPremade braided stainless steel oil lines with durable -AN fittingsThermostatic oil sandwich plate allows oil to reach optimum temperatureMishimoto Lifetime Warranty