Are you sure it's the 2017-2018 model, I always though it was the 2006 model showing in brand central.
I don't think the 2017-2018 model will be added to the game for a while since it's owner numbers are quite low and not sure PD would
be allowed to do photographs yet due to the contracts associated with the car and it's owners.
I read somewhere I believe in the suggestion guidelines that Gran Turismo asked GTP to create a suggestion forum for everybody. There are many vehicles on that list that have made it into the game.