A Voltex dual element wing with a trunk deck spoiler was used in this picture from 2014. Currently the car has lost the rear deck spoiler and and has grown a biplane lower wing element right above the rear deck. The new lower wing element probably generates some downforce from cleaner air at the sides of the car and helps activate the diffuser.
Although the aero surfaces are huge, they are relatively conventional, albeit with a lot of CFD tweaking and easily work around the stock unibody, unlike the Nemo Evo's radical ground breaking and rules bending aero. The Tilton Evo is a car that most of us can relate to.
The Tilton Evo at speed is awesome to behold. The complexity of the side aero bits can be appreciated in this shot. Strong side vortexes are probably being created by the outward cant and contour of the splitter sideplates to really seal off the sides of the car to the ground. You can also more easily visualize how the airflow off of the sides of the front splitter diffuser interplay with the side skirts for additional pressure recovery. It is also easier to visualize how the front splitter center kickup works to reduce pitch sensitivity in this shot.
In this rear view you can see how the elaborate features of the rear of the sideskirts recover pressure and create some very strong vorticites to enhance the effectiveness of the rear diffuser. The vertical air trap/vortex generator of the dual deck side skirt is more easily visible here as well. If speed limitation or cost reduction is ever going to be a factor in time attack cars, aero is the place to level the playing field.
In the spirit of traditional time attack, the Tilton Evo has all of it's unibody in place unaltered in between the shock towers. An all inclusive chrome molly cage stiffens the chassis. The roof skin has been replaced with bonded on dry carbon although the entire ring module of the unibody is completely unaltered.
Although the car drips with trickiness we were surprised with the mounting of the shoulder harnesses. WTAC rules don't require a shoulder cross bar like American rules and the harness is mounted way back to a bar that connects the rear shock towers. This would not pass American tech! It puts compressive stress on the seat and maybe the driver. As a note, some WRC cars mount harnesses like this. You can see the rear air jacks here as well.