[aerohead]

I can see a NACA submerged inlet on the near side under nose image. If it's 'twins', I don't yet know where they exhaust to.
And voids above the two outer 'slow' diffuser sections. I've no idea what's going on in those voids.
The center of the diffuser is radical. That cost me me almost 5-mph at Bonneville.
I haven't seen a top-speed mentioned for the car.
If it's a 'high performance' sedan, then there will be drag concessions to high-speed directional stability.
The GAC's lower body begins final plan-view boat-tailing where the small of the back for the rear seat is located.
The greenhouse begins plan-view boat-tailing at the driver's hips.
The base pressure of the wake would be relatively high, perhaps exceeding the pressure at the beginning of the rear wheel-houses.
Without a Cp profile along the top, sides, and bottom of the car, it's hard to know where local flow would favor direction.
One Chinese auto journalist has mentioned that aerodynamics is not something of interest to Chinese consumers, and the GAC will never be manufactured; so the prospect of any 'road tests' of the 146 is just a pipe dream.