At the Main Menu press R2 L1 Square Circle Circle Circle.
At the Main Menu press Up Up Up Up R1 Square Circle.
Unlock the bikes in select bike screen
To unlock the bikes in the select bike screen u have to beat the hardcore part of career mode
for these stunts hold l2 and r2
no hands - up down
At the start of a race, start your engine at three. then, hold r2 at one and until your at full speed.