Super Mustang: Play the Stock Car level. When driving past a certain
speed, you will hear a sound that will confirm that the Super
Mustang has been unlocked.
Hint: Maximum air: Go to Ford Collection and select "Time Attack".
Choose the Temple Ruins track. Use the '56 Ford F-100 as your
car. Once the race has started, turn around and go as fast as
you possibly can, then go up to the big hill just after the starting
line (still driving the wrong way). You will fly at heights of
over 50 feet. Try different cars for even bigger heights. PatEnglsh.