Whelen Aerospace Technologies (WAT) has several very effective yet simple speed mods for your airplane. SPEED SPATS reduce the drag caused by the retracted but somewhat exposed main gear wheels and tires. WAT Speed Spats are worth 4 MPH in cruise speed at 75% power.
The Speed Spats come as a kit with four (4) molded fiberglass parts with a white gel-coat type product coating on the outside, and bare fiberglass on the inside. The kit comes with an ample supply of pull-rivets; installation instructions; STC information; and set of master drawings.