Unlock the following drivers by performing the corresponding tasks:
DRIVER - HOW TO UNLOCK Billy and Bobby Backfire - Win the Dirt Series. Joey Logano - Win 51 trophies. Kelly Kates and Linda Leadbetter - Win the Street Series. Maurice L'eclair and Monica Torres - Win the Euro Series. Richard Petty - Win 43 trophies. Shakes McDaniel and Thriller Tadwell - Win the Xtreme Series. Terri Winsome and Luke Trigger - Win the Muscle Series.