Speed_Bump:
The Capri's rear end is made such that air has a hard time separating from the vehicle without creating a lot of turbulance. My opinion is that your spoiler is probably helping air separate more cleanly.
Another thing that I might recommend looking into is whether or not your bumper is acting like a scoop, trapping air under the car. If you can find a way to help air get out from under the car better, it would speed up the air flow under the car as well as help fill in the low pressure area directly behind the car.
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