I think it increases the amount of fuel going into the engine. Doesn't increase performance, but uses more fuel and will increase idling. At least, I think that's what it does.
Most cases the "chips" (or resistors in most cases) fiddle with the readings from MAF sensors or similar, tricking the ECU into thinking its being given more air than it actually is, and hence increasing fueling to compensate.
Result: Increased MPG, coked up plugs, and naff all gains.
fact it says race mode is easily good enough for another 40hp, it lights up for another 5hp
if 45hp extra is the difference between economy and exhilarating performance, then you're either in a 2cv or got more to worry about than a shiney switch, like the fact you just lost 25hp cos your sun strip fell off
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