They usually just throw that one in the glovebox for ya.

 

Or in the box when you order online. Yep,put my own stickers on and haven't got the kit installed yet! Is that like "putting the cart before the horse" or one of those other old sayings?

 

Put mine in the build book, I'll let the next owner install them if they want.
Also on top of the motor just next to the lower right corner of the air box is a sensor if it says Bosch then you should have Stage 1, but since your not sure take it to your local dealer or ask ChevyMgr he'll need your VIN # it'll show if you do.