I have for sale a Hypertech Max Energy #32004. I bought this for my 2008 Silverado 1500 with the 5.3L engine. This is a great unit as it also allowed me to tell the computer the tire height. This unit will work form 2007 - 2010 Silverado/Sierra. Please check with Hypertech to see if your vehicle is supported. Hypertech phone # 901-382-8888 My original Silverado was reset back to original programming so this unit is ready to be used on a different vehicle. I flashed the 32004 to Hypertech's latest firmware for this unit. I have the original box, cables, CD, documentation, etc. Since you use the unit to program only, it spends most of its life in a closet. I will take $275 with free shipping to any of the 48 states. If you wish to pick the unit up, I live in the St. Louis area. You can PM me or call my cell 636-578-6919. Thanks.