Originally Posted by kenneth
What you say about the wings make sense! I have been wondering whether the diffusers you have fabricated would be accepted at road course events such as the BMWCCA or PCA HPDEs ?
Yep, so they are definitely 'accepted' at any and all PCA/ACNA/BMWCCA events, and all of the NASA events as well.
The only series I know of that bans diffusers is the Continental Grand-Am/Rolex Sports Car series.