i think its easily possible mate. a decent remap and it should add some umphh. but don't st's have a 6 speed box?? chipping a car is utterly reliable so long as you use someone that knows what there doing. and also you should make sure your engine is strong, as a chip puts extra strain on the engine and gearbox for that matter, thats if you plan on having it longterm. but don't forget to upgrade yours brakes an stuff as well