My Cessna 185
was the first 185 on which Willard Jackson installed the speed kit. I already had wheel
pants, so I was pleasantly surprised when Willard flew my plane back a few weeks later
with a 10 knot + increase in speed. These old 180/185s are so loaded with excess items
that add drag, that any reduction in drag is readily apparent on your airspeed indicator.
Of course, all planes are different, so I generally tell people they should expect a
noticeable improvement. The folks who don't have wheel pants and who operate in rough
muddy terrain are the ones who would benefit most from this kit.