How many BHP does it take for you to consider a car "powerful"?

300

Depends on the weight of the car

350

Weight to power ratio matters most to me,
but i’d say from 230bhp

375-400

Around 300.

250-300bhp usable brake

Depends on the weight. I would say .20hp/kg

Depends on the car, but 250+ is pretty powerful for 1000-1150 kg

600