[7000rpmisheaven]

You could build a 300 HP street car with the intention of running a 250 shot at the track. It would be a fun yet managable street car, and it would be a monster at the track

You could build a 550 HP turbo car but I doubt its manners on the street are going to be as good as the 300 HP street car.

A 550 HP naturally aspirated car would be down right dangerous on the street.

There are no rules. Period. There is no way it can be cheating. Nitrous just allows you to burn more gas. The same principle behind superchargers and turbos. Its not rocket fuel.

You are probably just jealous that someone got there hands on some power cheaper and easier than you. You won't run it yourself because you are scared you would blow your motor up cause you know nothing about it.