Direct Replacements that Deliver Seat-of-the-Pants Performance Over Stock Exhaust Manifolds. These Edelbrock shorty headers have outstanding performance features such as mandrel-bent tubes and laser-cut or stamped flanges. They are direct replacements for stock manifolds, so installation is simple using the factory crossover pipe. Headers for throttle body injected engines are made of 16-gauge 409 Stainless Steel to withstand the high-heat environment, other Edelbrock headers are made of durable 16-gauge mild steel. Two finishes available: Ti-Tech and Ceramic Coating. 50-state street legal.