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Ford Explorer Community - Maintenance - Modifications - Performance Upgrades - Problem Solving - Off-Road - Street
Explorer Forum Covers the Explorer ST, Explorer Sport, Explorer Sport Trac, Lincoln Aviator, Mercury Mountaineer, Mazda Navajo, Ford Ranger, Mazda Pickups, and the Ford Aerostar
IMHO, you'd probably see "some" performance gains with an Apten chip, but not nearly as if you had a computer controlled automatic. You only have to use premium if you ask them to burn a 91 program for you. They do have 87 programs as well. My gut feel is that you'd hardly notice much performance gains running an 87 program without the refined shift points.