This is not a reccomendation, but ....
Quite some time ago, a friend and I tried running some hose from the air intake
in his dodge's air cleaner to a can of spray whipped topping. We let the can settle,
and held it upright and sprayed. It sounds stupid, but they do use NO2 for
propellant, and we did notice a slight increase. I think that thing just sucked in
too much air, but a ped may be a different matter. I don't know if they are still
using NO2 in those cans or if you really want to spray it into your air box, but
it should prove entertaining at the least :o)