Evinrude E-TEC is the best of both technologies. It provides the quiet, efficiency and cleanliness many customers associate with the 4-stroke outboards, combined with the torque, throttle response, quick acceleration and raw power associated with the 2-stroke outboard. The technology is considered 2-Stroke, Direct Injection. Evinrude E-TEC in fact, has cleaner exhaust emissions than a 4-stroke, it produces 5 to 10 times less Carbon Monoxide (CO) while idling or trolling.