CMI BIG TUBE HEADERS

CMI Big Tube headers enable big block engines with 540 cubic-inch displacements or more to deliver peak horsepower and torque throughout the entire operating range. CMI Big Tube Headers are proven to withstand one of the toughest marine environments on earth – offshore racing – and have powered more National and World Championship boats than all other brands combined. CMI “Big Tubes” can be custom stepped in any configuration to meet any engine builders’ requirements.