The only problem it would ever cause would be water / dirt ingress.. but thats the same with any opening in the shell for cooling really.
aerodynamics on the shell don't really come into play when there is a shock tower in front of it all.. The kit wing on the keen hawk (might be same for the impact) is pretty much used as a bumper also and has no effect at all on downforce I reckon - it is tiny and mounted far too low behind the rear tower.
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