The 2010 Mustang GT has 315 horsepower versus the 300hp in the 09 GT. It's got a true cold air intake setup and revised tuning for the 15 extra horses. We have a 2010 Mustang V6 here at the dealership, I like the new sequential LED tail lamps and the new optional backup camera... We have a couple GT's on order, they come in next week...