Direct fit for 2001-2005 6.6L Duramax Overall Size: 45.6' x 20.8' x 5.4' / Core Size: 34.06' x 19.61' / Rows: 2 Inlet & Outlet: 1.89' / Core Thickness: 2.2' / Tank Wall Thickness: 0.08' All-aluminum construction includes magnetic drain plug Mishimoto Lifetime Warranty