Did you at least kick him in the nutz for being stupid?? They might offer a little help on our small motors as long as you aren't wide open throttle, but you also put a bigger demand on the alternator with it, which puts a bigger load on the motor.
Hehe yah to get those gains you need either a looooong extention cord or a 2 stroke motor on your intake. Tie that into the electrical system and bye bye gains. Thats basically a ram air effect seeing how a leaf blower cant give much more than a lb or 2 pressure.