Now available, apparently, from ECS Tuning.

Parts in ABS (would prefer Carbon Fiber!). Front splitter, rear diffuser, side splitters, etc. Says for Avant, but why not for sedan?

No affiliation with either Maxton or ECS.

http://www.maxtondesign.eu/sklep/rs6.html

https://www.ecstuning.com/Search/SiteSearch/Maxton/

CW