Unlock the following Muscle series cars by performing the corresponding tasks:

CAR - HOW TO UNLOCK
Assassin Muscle - Get 30 Takedowns.
Classic Legend - Win the Gold medal at the Big Sure Shore Legend Face-Off.
Dominator Muscle - Get 25,000 Burnout points.
Legend J-Muscle - Win the Gold medal at the Airport 1 and 2 Legend Face-Off.
Muscle Cop - Win the Bronze medal at the Harbor Town or Sunrise Valley Pursuit.
Muscle Collector - Win the Gold medal at the Harbor Town Eliminator (type varies in each game).
Tuned Muscle - Win twenty Gold medals.