I think I get it now. He has a '305' horsepower V6 Mustang.
Look at his horribly low resolution
garage. In the first PIC you can make out that it does not have GT fog lights in the grill, yet his bottom picture is clearly a very low resolution picture of a GT.
He's lying. This would make the '305' thing much more believeable.
Very typical for children to either:
1. Not know what their parents bought them.
2. Outright lie to make themselves appear to be 'cooler'. Pictures were taken in a working class neighborhood. It's obvious he's ashamed of that.