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These 304 stainless steel, 3/8 inch thick water jet cut header flanges are used by LPE in-house and are great for your next custom exhaust project. These are the same header flanges LPE uses to fabricate our LS series turbo exhaust manifolds that use 1 7/8” diameter primary tubes. Designed to work with any dipstick configuration and fits all LS series GM cylinder heads. Sold each.