Thanks - so the trophy for finishing first in every race in every car is multiplayer? Sounds nigh-on impossible..?
In SP you can *only* do the 5 listed races with each car (plus the 12 Vita exclusive races, which you can do with any car), but in MP you can use any car for anything (except the ones with a class restriction).
I don't fully understand how the races are divided up between the cars. Each car has five specific races which provide upgrades, but each car can do any of the tens/hundreds of races? What happens if I do a race in a car that's not on the list of 5 on the top left menu?
Er, simple :/