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I don't have a 91, but I would think that anything that the factory put in place to direct air, would have some impact, those with earilier model rangers, I'm sure will be jumping in soon to, give you more insight.
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.