We have been working with Ultimate Headers to develop these awesome headers to work with our LS engine swap kits. They feature investment cast flanges that provide a custom look never available before. They are made from race proven 321 Stainless Steel tubing for light weight and durability. The 1 7/8" primary tubes have shown on the dyno that they will support 600+hp with virtually no disadvantage to long tube headers. They're available in a brushed satin finish, a mirror polish, or a black ceramic coating. They come with stainless bolts and washer, stainless gaskets, and investment cast collector flanges that are unwelded to give you installation options. If you're looking to give your project the sculpted elegance of a true work of art, these are the headers for you.