DeWitts - 1979-1993 Mustang Direct Fit­® Radiator - HP SeriesDeWitts HP Series all aluminum radiators are made to order and built for high performance applications. Typical uses include track days and sustained high speed driving. The larger 1. 25" tubes add additional surface and increased capacity. This increase in surface area requires an elevated continuous air flow to optimize cooling efficiency. HP SERIES (2 ROW 1. 25" TUBES)Model: 32 1148012MModel: 32 1148012AModel: 32 1248012MModel: 32 1248012A