oh i didn't buy the diagram on how to make it. I bought the unit already made from speedtweaks. I know they went out of buisness and i stumbled across a new one on ebay so i bought it. and ya i've heard about the resistor trick. I would stay away from it. just relocate your IAT into the intake tube. The pcm reads a certain resistance from the IAT sensor and if you don't get the right one it won't work or it will send a trouble code to your pcm. I know i saw one somewhere i'll have to keep looking for it and if i find it i'll post the link to the website.