The GR Corolla extracts 300 horsepower from just 1.6 liters and three cylinders, pushing every component to the limit. The stock cooling system struggles to keep up under sustained track use and some owners have recorded oil temps exceeding 260°F (127°C) on track. The OEM liquid-to-liquid oil cooler depends on coolant temperature to maintain safe oil temps, a cooling system that can't keep up puts your engine at risk from two fronts. The Protection Bundle addresses that vulnerability from every angle.

At the heart of the bundle is the Mishimoto Performance Aluminum Radiator, replacing the stock plastic end tank unit with an all-aluminum one with a core that is 51% larger. More core volume means more coolant capacity and greater heat dissipation, placing less stress on the entire system. Strutted tubes maximize effective cooling area while significantly improving core rigidity, helping prevent leaks from impacts like potholes or off-track excursions. Louvered external fins circulate air throughout the core for improved heat transfer, and the included foam shrouding ensures air passes through the core rather than around it. Reinforced intercooler mounts support larger aftermarket intercoolers, and an extended drain port with a slotted drain plug keeps maintenance clean and straightforward.

Connecting your new radiator to that high strung engine are the Performance Silicone Radiator Hoses. Unlike rubber hoses that degrade over time, high-grade silicone construction offers superior heat tolerance, pressure resistance, and long-term durability. The kit includes upper and lower radiator hoses, expansion tank hoses, an ancillary hose, and all necessary clamps for a straightforward installation.

The Expansion Tank replaces the stock plastic unit with an all-aluminum direct-fit tank. Internal baffles eliminate air pockets that can form during aggressive driving. Those air pockets, if left unchecked, can create hot spots capable of causing serious engine damage. We made the tank 40% larger further stabilizing coolant temperatures, all while remaining direct fit for your GR Corolla. An easy-access bleed port simplifies air bleeding, and a high-visibility sight glass with a stamped cold-fill line makes coolant level checks quick and easy.

Rounding out the bundle is the Thermostatic Oil Cooler Kit, the direct solution to the GR Corolla's most documented weakness on track. Mishimoto's 14-row dual-pass bar-and-plate oil cooler mounts in the upper grille using direct-fit brackets, delivering a dyno-proven 13-degree average reduction in oil temps. The kit adds 0.76 quarts of oil to the system, keeping temps in check during longer stints on throttle. Pre-assembled black nylon-sheathed -10AN braided stainless-steel lines provide ample flow and make installation straightforward. The thermostatic sandwich plate ensures oil reaches operating temperature before flowing to the cooler, making this kit equally at home on a daily driver as it is on track.

Together these components address critical weaknesses in the GR Corolla's OEM cooling and oiling systems. The Protection Bundle is built to keep your engine protected whether you're pushing hard on track or sitting in traffic. All products are backed by the Mishimoto Lifetime Warranty.