Aircraft respond well to the flap gap seals as they create a pressure barrier between the high pressure air on the bottom of the wing and the low pressure air on the top of the wing.  Gap seals will add 2-3 MPH to the plane, as well as 100 ft/min increase in rate of climb.  This is one of the best speed mods you can add to an aircraft.

The installation is done with Cherry/Max rivets in the flap well....no exposed attachment!  This kit looks like it was meant to be there from the factory....not an afterthought.  It comes complete with everything necessary to install including all hardware and step-by-step instructions.