I'm wondering the reasoning behind their end plates. I'm under the impression larger is better, but they have some is the smallest I've ever seen.

not sure about that either, but their wings are wind tunnel tested. i made larger end plates for my RX8, lol.

https://scontent-iad3-1.xx.fbcdn.net...36&oe=5DD987FB

If they work, I'm all for it. Just weird that I've never, ever seen a "legit" wing with small end plates.

end plates are basically to stop the air tipping off the side of the wing and to reduce the vortice's off the wing. bit like wingtips on planes.

Kyle.engineers on youtube has a great explanation on it:

Correct. {thumbup}

yup keeps the high pressure on top of the wing separated from the low pressure on the bottom at the edge.

Any new developments on options here? DIY Splitter and rear wing are at the top of my list for off-season mods.

I'm still doing splitters. Shoot me an email and I'll send you options list and order form for a splitter. Ayoustin@gmail.com