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The theory they work on is fine for carb'ed engines where the fuel is suspending in the incoming air. But for throttle bodies (EFI), the fuel is injected so far down the line that throttle body spacers are irrelevent.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.