what kind of power am i makin here?

So he's going to run a bottle against your "all motor car"? I'd be busting his b@lls about that in front of everyone there, especially his friends!!!
LMAO!!!
At least he can do is run the first race motor to motor, then run the second race bottle to motor. Also make sure he disconnects the Nitrous line from the bottle.
Don't agree to doing it the other way(NOS first, then motor second), because if he uses the bottle and doesn't beat you by as much as he thought he would, his car will probably suddenly have a problem that will prevent him from racing you motor to motor.