THE H.O. SERIES. BLURRING THE LINE BETWEEN BOATING AND AVIATION. Like pushing limits? Then take a closer look at our High Output Series. Because they push limits about as far as they can go _ and come with everything it takes to handle it. Like a high-performing SLE (Straight Leading Edge) gearcase with nose-cone pick-ups that significantly increases water flow to the engine and provides increased cooling ability and capacity. High-quality gears with super pure, extra-tough metallurgy. And stiffer engine mounts for superior handling and control at high speeds. If you're looking for that extra bit of oomph, this is it. No matter the application, the H.O. series gives you the maximum performance you're looking for.