yup it will give you 20000000000000000000000000000000bhp increase
and those things are getting cheapers still walk into maplins and you can get the same resistor for around 20p
its crap because it connects to a sensor - varies ones connect to, Maf, temp sensors,etc
basically it tells the ECU that its getting more air than normall, or that the engine is cold. ether way it makes it inject more fuel.
all youll find is that it
might feel a little more responsive, but drink fuel and decrease the life of the engine.
buy cheap buy twice or you get what you pay for comes to mind
why do you think that remap companies charge around £200 for a new fueling map, which would give you around 7bhp when they could just chuck on one of these and say theres your 15bhp
live and learn mate.
as long as your next question isnt about the electric superchargers or ecotec valves