When you hear the term ported Eaton used in ’03-’04 Cobra circles, it refers to something that looks like this. Stiegemeier Engine Air Flow is the company that has mastered hogging out the passage area of OEM Eaton M112 superchargers. The increased size does not specifically increase boost, per se, as Roots-style Terminator blowers only move a fixed amount of air volume. So, in lieu of boost gains, the size increase brought about by porting basically speeds up the rate that air is forced into the engine, and helps decrease the amount of heat that is generated by the rotors. With each port job, Stiegemeier also opens the blower’s air-inlet passage, as well as the throttle-body plenum.