Okay, so just opened it up now and heard about how you can't use the cars you use for the time trials to do the actual challenges.

I'll post my current garage, will keep the details simple (and obviously haven't bumped up all of these yet), can give more if needed.

Tier 1:

Toyota 86 - 0* - 351PP - 310 EVO

Golf GTI - 1* - 349PP - 427 EVO

Mini Cooper S - 1* - 164PP - 0 EVO

EDIT: Used the Toyota for the Time Trial.

Tier 2:

BMW M235i - 0* - 458PP - 218 EVO

VW Scirocco R - 1* - 360PP - 26 EVO

Tier 3:

Audi RS5 - 0* - 545PP - 187 EVO

Mustang GT Premium - 2* - 530PP - 249 EVO

EDIT: Pulled it off with the Audi, it dyno'd fast enough for the trial but the Mustang didn't.

Tier 4:

Viper GTS - 0* - 645PP - 245 EVO

LB GT-R Premium - 4* - 638PP - 279 EVO

Tier 5:

Ferrari F12 Berlinetta - 0* - 702PP - 301 EVO

(Definitely gonna need to buy a 570S or Huracan, I'm thinking)

I think I'd prefer to stick with cash cars since I don't wanna pay real money and the buy-and-strip tactic sounds handy. Though I suppose other options could work.