Ok I have a 2003 silverado ss with the 6.0. I bought about 2 years ago with 15000 miles the truck came equiped with the whipple supercharger. From the looks of it it has the whipple electonics and still has the 4.5 inch pulley. I added a boost gauge and it reads around 5 pounds of boost at wot. I'm just curious what kind of hp and tourqe #s I should be getting. I've been wanting to take to the track to see what it can do. Also. Every now often my check engine light will turn on then it will just turn off should I be worried. I don't hot rod my truck so I was just curious to y it's turning on.