Restore your cooling system with the Mishimoto Essentials Bundle. The Mishimoto Essentials Bundle includes high-quality upgraded coolant components to replace items we've found to be the most failure-prone. For the 2015-2021 Subaru WRX, we've bundled together our aluminum radiator, silicone radiator hose kit, silicone ancillary hose kit, and racing thermostat.As the stand-out component, our aluminum radiator features full aluminum construction with durable TIG-welded end tanks. This radiator provides a 117% increase in coolant capacity and a 34% increase in air surface area. These enhancements provide superior heat dissipation and optimal cooling efficiency. To supplement our robust radiator, we've included our incredibly durable silicone radiator hose kit and silicone ancillary hose kit. Mishimoto silicone hoses are constructed from high-grade 4-ply silicone with heat-resistant embedded fibers for superior heat and pressure tolerance. Finally, for maintaining low fluid temperatures, we've included our Subaru WRX Racing Thermostat. The Mishimoto thermostat has a lower activation temperature (165.2F) compared to the factory thermostat (190.4F). The lower activation temperature allows coolant to flow through the engine earlier, reducing the risk of overheating in hot environments. Time to re-habilitate the cooling system of your WRX with the Mishimoto Essentials Bundle. As with all our products, this bundle includes the signature Mishimoto Lifetime Warranty.