this chip is nothing but a resistor . They will ask you to un plug ur IAT sensor grip and plug this resistance to the grip .
4.99 pounds means what more than 500 rupees , you can do the same mod in just 1 rupee .
you just need an ohm meter for this.
get up in the morning when the weather is cold , popup the hood of ur car un plug the grip if IAT sensor located on the air intake pipe , measure the resistance of the IAT sensor which should be something like 2k - 4k , what ever the value is go to hall road buy a resistance of the same value and plug it into the IAT sensor grip and thats it. Its going to do tha same as this 4.99 pounds chip is gonna do