Koyo Radiator - 19-20 Toyota Corolla Hatchback 6MT and CVT (E210 Chassis) - KH013624R SERIES 53mm Core Thickness Built with a robust 53mm core, the R Core Series is engineered for the serious performance tuner. Increased capacity means better cooling reserve when you need it. Intended for both circuit and daily use, you may double your coolant capacity and see up to 35% increased performance over your stock radiator. Unless noted otherwise, all Koyorad R Series All Aluminum Radiators are Nocolok brazed, designed as a factory fit,