THE 2009 SILVERADO HAS A MAF AND A MAP SENSOR. THE MAF IS RIGHT AT THE AIR FILTER ,AND THE MAP IS ON INTAKE MANIFOLD AFTER THE INTAKE. I WOULD LIKE TO KNOW WHAT ONE IS NEED THE ENHANCER DONE ON. THIS LINK IS TO THE ONE I HAVE TO PUT ON .
http://www.fuelsaver-mpg.com/map-maf...p-maf-enhancer