Now, that's an example of thinking outside the box. On most of the dyno runs I've documented, rams' horns give a measurable gain in HP somewhere above 3K RPM, and they don't rob low end torque as badly as most headers do. Cast iron exhaust manifolds also don't leak, burn spark plug wires, and increase under-hood temperature the way headers do. Other than giving the rubes at a car show something to marvel at, I can't see much of a reason to run headers on a street-driven vehicle, particularly a stovebolt truck.
Jerry
