Interesting undertray and splitter on this race car.
 

I stumbled upon these guys site. A couple good simple articles, but what I like most is that undertray/diffuser design.
https://www.langracing.com/e46-race-...now-available/

Looks durable, would have to be for racing.

I like the very clean design. Simple and effective.

That's more of a bash plate.

It is elegant and would be relatively easy to install, I guess, but there are a lot of open areas along the sides that would be drag producing. I like the comment about it being "more of a bash plate" ... one with a diffuser.

Well, that’s one way to do it. I like it.

Along the sides begs for side skirts...

It's only the racing crowd that they would make money on...

The linked article doesn't have material thickness or weight. Do they disclose that?

Any wider and it would be hard to get under the car. :) The areas before, between and after could have solutions that attach to the flanged edge.

It looks like a job for Polymetal/Alumapanel to me:

https://tpc.googlesyndication.com/ic...48404312982401