Utilizing the longest radius in the industry all kits (aluminum and stainless) are built from high grade thick wall aluminum and high grade thick wall 304 stainless. These kits are factory replacement and work with factory turbo location and intercooler. These are bolt-on units. All of these kits are hand made and polished in the U.S.A. Includes 2 silicone boots, 4 stainless clamps, and manifold flange 0-ring.