Well if the NOS don't get me then the water/Meth or the 80l fuel tank will
As Neil said NOS aint cheap to do it right, you can just bang a 50 or 75 shot in for giggles but you won't do the engine any favors without the extra bits.
If it's cheap power you want I would say look at other cars.
Of course if its power and Class -
POWER -
For EXTRA Class add Green Paint