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 WRXSTI 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 degrees Fahrenheit 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 WRXSTI 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, ensuring superior product quality and craftsmanship.