My dealer let me do that two weeks ago, with no penalty, and was happy to accomodate me since the original car I ordered in February was an automatic built on April 13th, and still was sitting at lot 51.
2012 Shelby GT500. White - Stripe Delete. Corsa Exhaust.
2011 Mustang GT - Premium. 6 Speed MT, 3.55 Gears. Sterling Grey, CS Front Lower Valance with Boss 302 Splitter, 2012 Boss 302 Wheels, Airaid Cold Air Intake, and Corsa Extreme Exhaust. Boss 302 Radiator and Oil Cooler. Steeda Sport Lowering Springs, Heavy Duty Strut Mounts, Adjustable Panhard Bar. Koni STR.T Struts and Shocks.