I did not see where the owner thought his car was worth more with or without that hood...I seemed like he was just asking if it was possible.
Just as possible as the 'little old lady' went to the nice bodyshop owner and asked if he would put a 400 hood on her car. To me, dealership installed parts added 'to make the sale' are no different than parts added at the bodyshop around the corner from the dealership.