Diamond Power Intake & Exhaust Valves works with Acura CL Honda Accord Odyssey Isuzu Oasis 2.3L SOHC VTEC L4 16v F23A7 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 98-98 Honda Odyssey 2.3L SOHC L4 16v F23A7 Engine Valves are made with excellent quality materials (Nickel, Chrome and Tungsten)