1 7/8" OR 2" x 3" Stainless Steel Long Tube Headers Must be used with Kooks X-Pipe Gaskets, and all installation hardware included These products are NOT legal for sale, installation, or use on a licensed vehicle in the state of California, and they do NOT meet CARB compliance Part Number 21612400, 21612600 Part Type Longtube Headers Brand KOOKS Vehicle 2005-2013 C6 Corvette Z06/ZR1 Material Stainless Steel *Item ships directly from vendor.