STEALTH SERIES: WEIAND's top-of-the-line dual plane manifold combines the low-end throttle response of a 180-degree design with the top-end power you'd expect of a single plane. Extensive dynamometer testing confirms that "Stealth" is the ultimate dual plane on the market, with a power range from idle through 6800 RPM. Best suited for engines that are equipped with aggressive camshaft profiles, headers, high performance ignition systems, etc. Features square-bore carburetor pad for aftermarket 4-barrel carburetors.