I have heard some people claim that wheelpants helps you see the airplane's orientation better in the air. Performance wise, you probably won't notice the difference unless you are someone who actually has onboard instruments that measure your plane's airspeed and the rest of the plane is already as aerodynamically clean as you can make it. Exposed cylinder heads, mufflers out in the airstream, servos sticking out of the side of our fusilages and wing bottoms, and we worry about the air drag of our landing gear!![&o]