im looking at trying to get a bit more "umph" from my mk1.5 1600 focus without going down extreme routes.

ive looked at a st170 but the extra for the car and insurance and running costs (ive heared that you never stop visiting the petrol staton) renders it pointless in my eyes.

ive looked at remaps and for a few hundred quid you get 10bhp extra. i stumbled accross nos and got very giddy at the results for the same price as a remap.

i would like to know the best ways of getting the extra power without breaking the bank and what are the disadvantages of using nos on a standard engine or just in general?

help much appreciated.