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JM Fabrications Exhaust Manifolds are made from thick walled 304 stainless steel tubing. Featuring multi-pass TIG welded joints and CNC machined 1/2" thick 304 stainless steel flanges. The ports are gasket matched and smoothed to perfection for the best of flow and each flange is surfaced for a leak free seal. JM Fabrications have many different configuration exhaust manifolds to suit your turbo and required needs. Backed by 5 year conditional manufacturers warranty.