Where is the best(cheap and reliable) place to get the GM 3 bar map sensor?

 

Chevy dealer. Do a search about the AEM Plug & Play about it controlling boost and I recommened a GM part number for a boost solenoid and some guy found at some GM website for a few bucks cheaper. I'd just go to the dealer! It will run you about 90.00 bucks and if you have a shop discount it will run around 65.00!