Barrel Style Liquid to Air Intercoolers are a proven and stealthy way to cool your intake air. 100% Lightweight aluminum, No Epoxy Used In Core Recommended for up to 390 CFM and 270 HP Pressure Drop: 1.1 PSI. Core type: Tube and Fin Air Inlet/outlet: 2.25" Water Inlet/Outlet: 1/2" NPT Female Maximum water/air pressure: 70 PSI Core Size: 6" long x 4" (Endtanks add to length) The air inlet and outlet on this intercooler go directly through the intercooler; preventing the air from changing direction can result in better airflow. Note: Most of the barrel style intercoolers available have barbed fittings instead of 1/2" NPT Female fittings like ours for the water inlet/outlet. Our fittings allow you to use one of our adaptors or installation kits (sold separately) to run traditional hose, or braided stainless steel hose and fittings, or anything else you can think of without any installation headaches. WARNING! Some Water to Air Intercoolers that you can buy online do not contain true water to air cores. A true water to air core has water passages that are much smaller than the air passages. This is part of what allows the water to air intercooler to be so small and have such low pressure drop. Some water to air intercoolers that you buy online use an air to air core design where the air passages for ambient air and intake air are the same size, with an enormous loss of efficiency. Buy from us to make sure that you get a genuine water to air intercooler core!