LoPresti Speed Merchants - LoPresti Speed Merchants designs and manufactures modifications to dramatically improve the performance of Pipers (Cherokee, Comanche, Arrow, Seneca, Saratoga, Lance, Cherokee Six and Seminole), Mooneys, Grummans, Cessnas. LoPresti Speed Merchants has also provided technical services to Lockheed, Martin, Lycoming Engine Company, Hartzell Propeller Company, Fairchild Aircraft, Pilatus, American General Aircraft, and AJ Aerospace, among others.