TEGIWA Aluminium Radiator. As you increase the power output of your Honda Nissan S15/S15 through numerous well-chosen performance enhancing mods, you need to keep a check on your engines operating temperatures. The more you demand out of it, the higher temperatures will be, so you would do well to invest in one of our aluminium radiators. As well as cooling your SR20DET engine more efficiently (up to twice as efficient). Our radiators are also noticeably lighter than OEM units, and fit perfectly with OEM brackets. We also stock slimline 10 fan kits, which are a direct fitment for this radiator.Core Size: 37mm