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These are great photos. Thank you so much.

The diffuser looks like it is not only wider, but much taller and maybe extending longer also. The top of the diffuser looks like it touches the bottom rear "A" arm pivots. This could add to the downforce even if the main portion of the bottom is just flat. The trick is keeping the flow in the diffuser attached. Pete, I think your guide vanes in your diffuser may be key to controlling the diffuser flow.

Overall, the bottom aero looks very similar to the Stohr concept. That is:
The portion of the splitter that is in front of the front wheels stays low to restrict flow to the high pressure front bottom of the front wheels. The front splitter includes a diffuser that vents into the front suspension "A" arms/springs/shocks. The air vents out behind the front wheel mostly over the flat bottom throught the front curved vent of the side pods. The front edge of the side pods seems to go more straight across the car then on my ProSport side pods. The entrance to the flat botton is the flat front of the splitter in the center and the leading lower edge of the side pods. There is the additional inadvertant entrance along the side extensions below the side pods. Finally, the air that was accelerated (and lowered in pressure) as it went under the flat bottom is slowed back down in the larger rear diffusers to reduce the overall drag associated with this under body downforce.

The major differences that are on the Stohr concept are:
1) The flat bottom entrance seems to be all the way across the bottom at the side pod leading edge (raised feet?).
2) The diffusers are even larger, encompassing the lower wishbones in the diffuser, and they curve outward as they blend into the flat bottom. But, I have not seen any diffuser vanes on a Stohr.
3) The rear wing is further back and lower with a very long lower side plate to allow the low pressure below the wing to complement and augment the diffuser/flat bottom generated downforce. There is no flip up spoiler on the rear deck that disrupts the low airflow to the rear wing (as there is on my ProSport).

Well any way, that is what I see in the various photos.

Chuck McConica