In designing, we regard balancing reduction of loss of pressure and cooling efficiency as important to bring an increase of torque and smooth response. We lightened the overhanging part by using 100% aluminum. It is possible to match with wide range of tuning from light to hard. Inlet of core is designed in taper, and every model is designed in one layer. The load on turbine is reduced by minimizing the loss of pressure.Straight Fin is adopted for an Inter Cooler of front installation type. The smooth air flow reduces the load on radiator. Corrugated Fin is adopted for an Inter Cooler of upper or side installation type. It is possible to get cooling efficiency at the position of less air flow.