Definitely, I've done it manually 140 times now. Still no Ferrari invite, and still only 3 Supra engines. That engine can fit 4 cars, so if we want a basic set of irreversible mods, i.e.:
- with and without wide body
- with and without weight reduction
- with and without engine mods
you need 32 copies of the engine. So at my current rate of getting that engine, you're looking at around 50 hours of grinding the menu system to get the necessary 32 copies needed just to explore the most basic of tuning/setup possibilities.