Diamond Power Intake & Exhaust Valves works with Honda CR-V Accord Civic Element Acura RDX Turbo DOHC L4 K23A1 2.4L K24A8 K24Z1 K20Z3 2 Year Warranty (This product must be installed by a certified professional mechanic) Same day shipping when purchased before 3pm EST Our products are tested and meet or exceed OEM performance requirements Fits 07-08 Acura RDX Turbo 2-3L DOHC L4 K23A1 Engine Valves are made with excellent quality materials (Nickel, Chrome and Tungsten) 2002-2008 Honda CR-V 2.4L DOHC L4 K24A1 2007-2010 Honda Element 2.4L DOHC L4 K24A8 2003-2008 Honda Element 2.4L DOHC L4 K24A4 2003-2005 Honda Accord 2.4L DOHC L4 K24A4 2006-2008 Honda Accord 2.4L DOHC L4 K24A8 2002-2005 Honda Civic Si 2.0L DOHC L4 K20A3 2007-2008 Acura RDX Turbo 2.3L DOHC L4 K23A1 2002-2006 Acura RSX 2.0L DOHC L4 K20A3 2002-2011Acura CSX 2.4L L4 DOHCK20Z3 2004-2008 Acura TSX2.4L L4 DOHCK24A Kit = VS070 8 Intake Valves = 7113 STD 8 Exhaust Valves = 7114 STD Head Diameter: 1.378&#034; -35.00mm Lenght: 4.295&#034; -109.09mm Stem Diameter: 0.2165&#034; -5.50mm Face Angle: 45