you can always buy on cdkey site. then get dlcs as you wish . the games brilliant.
@subroutine thats part of mastering the game and learning. each car will handle differently. its a case of learning and tweaking until you get the best out of them.
if you going for a top time this is how i approach it.
drive the event stock dont tweak until i cant get any faster.
then i will tweak gearing until cant get no faster or normally just through a few sector times and up.
then adjust the rest bit by bit. until its all dialed in.
you can get world records with stock tuning if...you good enough or know the event well enough. starting out dont set your goals positions too high. most of the top times will be set by vets.
experiment with set ups. gearing first them the rest afterwards. but ideally dont touch anything until you know the event inside out.
fiesta is nice i prefer the mitsubishi space star myself. often underated but it tops many of the R5 leaderboards.