I moved my exit exit out through the bumper so as to avoid spoiling the line across the back and avoid cutting it. It also acts like a blown diffuser like the F1 boys have.
Yes extend it further forwards so that there is some flat section before it sweeps upwards.
The angle is probably too steep as it is but depends on what wing/s you are using on the rear of the car and their proximity to the diffuser exit. If anything I would say make it shallower.
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