extremeturbosystems.com — At the heart of the KA Turbo kit is a fully TIG welded, Heavy Wall Stainless Steel, Equal Length Manifold. This manifold is manufactured out of the highest grade 304L stainless, and with a wall thickness of 1/8" it will never crack. To ensure the ultimate in flow and to equalize back pressure at all cylinders we use a 10deg. Merge collector to join