I have a 2017 ford explorer, those vehicles have a problem of exhaust fumes somehow getting into the cabin. This usually happens after hard acceleration on highway. ford offered free repairs and tried to find a solution for this, re-sealing the rear of the vehicle, reprograming the HVAC etc, but TMALSS, they failed.
The (presumed) cause of this, is the aerodynamics of the car, causing a swirl effect and low pressure area behind the liftgate, trapping exhaust fumes back there and allowing it to seep into the cabin.
My question for the experts: can I use vortex generators or any other aerodynamic element to effect this? can these exhaust fumes be "pushed" further away from the vehicle?