What do you do with horsepower in excess of 600 ponies? Who knows, because in 99.99% of driving circumstances, you're not going use it.

But you will still incinerate gasoline at an alarming rate. 

If you do try to tap into the power, you run a gamut of risks. You could lose control of the car and have a very costly accident. You could pay no attention to your actual speed and endure a very costly speeding ticket. 

You could also just get depressed. Nothing is sadder than a supercar stuck in traffic, looking gorgeous but with no hope of unleashing its potential. You paid for that power! But you'll rarely get to experience it.