The FLUIDYNE Therm-HxTM "Parallel Flow" Heat Exchangers are the "Original" new innovation in Engine Oil Cooling. The DB-30500 all-aluminum unit is track tested and is the choice of thousands of teams in all forms of racing including off-road, dirt track, short track and super speedway. The compact design of the DB-30500 provides a significant performance advantage for alcohol burning midgets, sprints and stock cars as oil coolers will preheat and stabilize the engine oil. The Therm-HxTM unit needs no air to cool your oil, just a portion of the hot water returning to the radiator and can be mounted in almost any axis for maximum versatility