Stack Oil Cooler The DB-30816-24 is a heavy duty single pass cooler designed to be mounted up front in the bumper area. The 88mm core is designed to withstand extreme abuse while providing excellent heat exchange. This cooler has -12 AN fittings for easy plumbing. This is a popular choice for the BMW enthusiasts looking for something to keep the engine cool while on the track.   Inlet AN-12 Outlet AN-12 Width Overall 28″ Height Overall 3.5″ Depth 3.5″ Weight 12 lbs