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the XR3 is a LOT better aero then the tri-mag.
One of the rules I know is NEVER shove air under the car - always try to keep air out from under the car.
My frontal area looks to be about 12 square feet. If I can use the 2.5 feet, it might be significant. I'm even giving a bit of thought to making "ducts" and using them to duct the air back through the opening.
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