I work fast
With HPDE coming quick, need to have something to experiment with. The splitter is by no means correctly done. It is probably too narrow, and there is no damn to help direct high pressure air around the bumper to the sides.
I was going for this look and 'effect' with just enough rear spoilage to help reduce lift, not necessarily add downforce:
Hopefully the downforce really isn't that much more than before, reducing the need for a proper front spoiler. I'll know by this track session, and have the winter to mull over a more complete design.
I'll get some photos later tonight.