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. Shorty 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.