EDIT: PATCHED. NO LONGER WORKING.
So everyone knows you have to get to level 50 and then buy all 3 levels of the Contender Outfit in the Garage. But what if, like me, you suck at Fusion and can't get to level 50?
No fear the hard working people at Track Central have you covered. Search for "XP" and play the Beginner Track named XP for Days. Be careful as there are some NOT so easy imitators. This track starts and stops at the exact same point so it is a INSTANT xp boost every time for doing nothing. So just sit there and hit RETRY until you get bored and want to see your progress. You will level up VERY FAST.