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The '86 Mustang GT was a carryover from '85 except for the fuel-injected 5.0L High-Output V-8. It had less horsepower but more torque, which is what counts on the street. Fuel-injected Mustangs didn't get mass air metering until '88 (California only) and '89 (49-state). Mass air metering is what you want if you intend to install a hotter cam or aftermarket intake manifold.