If these come in, I think people will be stunned by two things:
The performance improvement
The cost
I know this, because I designed and engineered the wheel spats for the Aptera .
You can invert a trashcan over a wheel, and then you’ll have all sorts of trouble. Start actually engineering them to be a useful consumer product and the engineering gets more complicated.
The main issue is that in sprint karting more bodywork = more expense, more contact, worse driving standards. And karting at its core is an open wheel discipline.
On big tracks or road racing with Superkarts, the bodywork doesn’t take a beating like it does on a sprint track.
Enough. I don’t have exact figures, but it’s a fair amount. The rear wing is not as effective as normal because of the blob sitting in front of it, but the floor produces negative pressure.