The new Turbonetics Evolution redefines performance for external mounted boost control. Utilizing the latest technology in flow design and materials, the Evolution features an investment cast 304 stainless body designed with computer flow analysis. "Nitronic 60" stainless steel one-piece valve, and polished aluminum billet cap. Nearly 25% smaller than the Deltagate, it is sized to fit into the tightest turbo systems. Fitted with a rolling type diaphragm and floating valve seat, it is equipped to comfortably handle 400+ HP and out flows the competition by almost 20%