Intakes don't do anything other than make the B58 a little louder, exhaust doesn't either. the only restrictive parts would be the catalytic converter and the upcoming exhaust filter.
We are going to have trouble going above 450whp. I think some have managed that on Cali's 91 octane, but any more power and you will start knocking on a hot day.
I still really like the way the 718 looks, but again, I don't see that much change. I bet most people would have difficulty identifying the differences between the two visually.
If I were in your guy's positions and being financially and logically realistic, I would probably not buy this car. There are just too many unknowns for such a high price. I would definitely have a M2 Competition for the price, with a stick.
I don't think so. Maybe the G20 3 series but definitely not the F30.
The Supra is based on the new BMW CLAR platform which incorporates many new parts. They completely retuned and redesigned the suspensions. Even if the physical parts are the same, the tuning is what truly makes the difference...