Re: Max M4 (Razor) at Stage 6?

Agree with @HeretikJirka. In fact I would expect much lower PR -- subtract 15 points for having one less star and subtract 3-4 points for each part not maxed out so you end up with 830-840ish PR (numbers deduced from my experience with maxing out a sport car, they are approximates, not exact). I would rather invest on Mercedes-AMG GT or Nissan GTR as they can reach 884 / 885 respectively. Upgrading purple to yellow costs about 2 million cash and I would rather invest it wisely.