Greddy mitsubishi evo 4, 5 and 6 spec ls intercooler kit about greddy intercooler kits the addition of a greddy intercooler is one of the best ways to safely increase horsepower in a turbocharged engine. By reducing the engine's inlet temperatures, a denser air charge will enter the engine; this can make more horsepower at the same boost level and even more power at higher boost.