Engine (305 HP vs. 210 HP), transmission (6-speed vs. 5-speed), rear axle (2.73:1 vs. 3.31:1 ; limited slip vs. open differential) upgrade.... Probably be about the same price to trade-up for "White Pony II".
I'm definitely considering trading up. Or I may wait for the '14 model and get the 50th Anniversary edition... Uhh, why wait? It's only money!
Off topic, I paid $750 for a ride in a
REAL Mustang today. A WWII P51 Mustang fighter plane. What a ride! We only got about 2 MPG, but...