Any aerodynamicists in here or track junkies who have recommendations on best rear diffuser options for R53?

It looks like to get a real undertray going I either need to remove the rear battery box and get a center exit exhaust at which point I have a ton of options in terms of design

OR....

I could design my own which either fits around my alta catback or a tray which hangs under everything so of like the DUZ design

 

sneedspeed has some aerodynamical data, but im not sure if they have a rear diffuser for the r53

 

Maybe do some research on the M7 Speed Rear Diffuser Tunnel Kit here. M7 states it has been developed to add significant down-force and reduce overall drag.

 

I just purchased a full carbon fiber M7 diffuser for my R53, although I haven't had a chance to install it.
The placement of the Battery box is the main reason why you don't see diffusers on R53s. Thus, most likely the reason very few companies make them. Ive seen people fitting the GP2 diffuser onto R53s now, which is a cheaper option. Not sure how much fabrication it requires though, Orranje posted pics of it on their IG

 

MiniLife be sure to post up some pictures of it for us once you get it installed!

 

I am probably going to be getting my guy to fabricate something. I want to go with metal rear diffuser and looks like I will have to run centered exhaust

There is no shortcut to having an awesome diffuser on the R53