Experience superior performance with the Perrin Top Mount Intercooler Blackfor 2015-2021 Subaru WRXs. Offering 10+ wheel horse power, it is one of the largest top mounted intercoolers on the market, with a core size of 10.24″ x 13.62″ x 3.75″ at 523 cubic inches. It is 66% larger than stock and requires no tune, helping you achieve more horsepower with cooler charge air.