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Hi FastP...,
On your gas tank to bumper piece. Start flush with flow off the tank, then sweep it to a 30 or more degree angle at the rear edge of the bumper (not the midpoint of the bumper as shown). This will make what they can a "difuser", which will help pull air from underneath the car and fill in the wake better.
In race cars this is used for downforce, but due to the height of your Cherokee its not going to do much of that. Just help fill in the wake better.
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