I have read that the GM pn 12580698 is a 2.5 bar sensor. I was told by another person that it is a 5 pin sensor with an integrated IAT. I called my local GM place and they told me its was 3 pin. To sum it up.....I am looking for the best 2.5 bar sensor to use with the 2.5 bar custom os for the e40. I dont want to buy the wrong sensor and pigtial. TIA