Diamond Power Exhaust Valve Set works with Nissan Altima 2.5L DOHC Same day shipping when purchased before 3pm EST Fits: 2002-2006 Nissan Altima Sentra Xtrail 2.5L DOHC 16V L4 Our products are tested and meet or exceed OEM performance requirements 2 Year Warranty (This product must be installed by a certified professional mechanic)