J'S RACING's best "SPL RR" vertical flow type aluminum 2-layer structure superlative model.
Low temp thermostat & low temp thermo switch are used together, ideal water temperature 70°C to 80°C. With a handmade manufacturing method without any compromise by skilled craftsmen, it is carefully manufactured one by one, not only has the best cooling performance, but also contributes to weight reduction and durability performance is secured. We promise the best performance on a wide range of stages from the street to the super endurance race.