For owners of the 2015 Mustang GT with Performance Package, one of the remaining unknowns has been whether the factory 20″ wheels would fit over the 36-millimeter Brembo brake calipers.
Mustang6G member Jmeo has solved this little mystery by purchasing and fitting a set of the factory 20″ wheels on his Magnetic 2015 Mustang GT PP.
With no spacers required, Jmeo reports that the 20″ wheels lose only 1/8-inch clearance over the stock wheels, leaving a full 1/4-inch between the caliper and the 20″ rim.
See details and pictures of the wheels fitment in the forums.