I think its a fake...
It looks to me like an S5... except the mirrors and the Y spoke alloys.
For me, I notice the lower front bumper first. On the S5, the fog lamps are in the middle of the pretend disk vents. On the A5, the fog lamps are at the top and actually break into the bumper area a little. Additionally, the 'disk vent' is a different shape at the grill end, following the line of the grill towards the centre of the car, before cutting back out again... the A5 just slopes down and out.
SO this car does have an S5 bumper (fender for those in the US!) However, this bumber could be bolted on to any A5.
The other bits of trim tell too, but these could be stuck on any A5. however, the integrated bootlid (trunk lid?? un the US??) spoiler is more pronounced on the S5 and this would be an expensive thing to do to a regular A5 to swap this.... to me, this looks like the
regular A5 bootlid....
which makes me think this may be a fake S5.
I'm am confused by the seats, it's not terribly clear, but they look to me like the regular sports seats (not integrated headrest), which surprises me... why would anyone change those lovely seats for cheaper ones? ... can anyone else tell? ... the plot thickens
OK... does it have S5 badges brake calipers? (also expensive swap)
What about the S5 logo on the instrument dials... or the steering wheel... surely no one would change those to make it look like an S5?
... have you heard it running? is it a V8? That's got to be the big reveal!
Finally, if you have a tape measure handy, the S5 wheels are both 10 mm further forward in the chassis, so the distance between the rear wheels and the rear of the car is increased to 1024mm and at the front from wheels to bumper, deacresed to 850mm.