Many cars nowadays can simply stop using cylinders when in a “road” or “economy” mode, that I think that’s a good solution.
If you want to learn about engines, http://automationgame.com/
Nifty game, the demo is quite fun to try :D Because of that, I actually understand the the CC is a combination of the bore and stroke of the cylinders.
Also 800BHP is a huge amount of BHP, for a road going sports car, you could easily look at half that.
Look up the Japanese Super GT series, their top level cars, the GT500, are power limited to just over 500BHP. Look up youtube videos of them to get an idea of what 500BHP is like in a racing car.