weel how do i unlock tier 2 parts and then upgrade because the 1st bosss car is a ter1 and its faster than any i can buy but its to slow to win
You must race on new races, on the next 2 terrortoies...you can see what you will unlock from races by reading the scrolling text.
But, bosses don't have Tier 1 cars...only Tier 2 (exept Darius who has Tier 3 )
If you have unlocked them, then you just can't afford them....do some more races...