never ever buy these, i managed to get a picture of one the other day, and they have got a lot more elaborate, but they are still just a resistor.
they are making millions selling these under different names.
i have reported every single one to e-bay and all i get back is "untill this user gets more negative than possotive feedback, there is nothing we can do as hes not breaking any laws, after all, everyone makes mistakes"
and ebay are making millions off him too.... so theyre not gonna do ###### all... but dont buy these ever...
i asked him politely to explain what it does and it reduces the current coming from the throttle body (air temp sensor) and so the ECU reads the air to be colder than it actualy is, this obviously sends the car into "throw as much fuel as i can" mode and as said before on other threads, fowls up the plugs, wrecks the catalytic converters, increases emisions, may coke the valves up to begary and generaly ruin the engine...
after arguing with him that you cannot "tune" a resistor he stopped e-mailing me...lol
ther's always one 
