It's a 5 volt resistor placed in the power line of the air temperature sensor that is located just before the throttle body in the intake. It adjusts the fuel flow accordingly to give the correct amount of fuel to the engine when it is running at high rpms. This is accomplished by "fooling" the computer by making it believe the air temperature is 20 degrees cooler than it actually is. You see Ford, being as conservative about the environment as they always are have starved our engines of the fuel that they need when they need it most, therefore cutting into our fun. This mod causes a huge gain in power over 4000 rpm and costs only $.20. Thanks to Dom for the idea and the part to do it by the way. :p

98.5 SVT ~ diamond white metallic custom DuPount paint ~ shaved antenna, trunk key hole, and ding strips ~ roof mounted antenna ~ 20% tint ~ clear corners (front) ~ Audi A4 sidemarkers ~ 17" Mille Mille Evo 5 wheels with Yokahama Parada Spec-2 tires ~ Koni adj. struts ~ Eibach springs ~ SMA rear strut tower brace (front no longer fits ~ Powerstop cross-drilled rotors ~ Mintex A/F pads ~ ploy bushings including motor mount insert ~ 3L conversion ~ full custom intake ~ custom Cardoc exhaust ~ gutted precats ~ 24lb injectors ~ 3L upper and lower intakes ~ Rear dome light mod ~ glovebox light mod ~ lighted moon-roof switch mod ~ fog light mod ~ Autometer shift light ~ FCO indiglow guages ~ body color interior bits ~ some custom sound

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