I have a HPPIII (#30019) for sale. For use on a 2003 GM truck with a 4.3/4.8/5.3/6.0/8.1 engine. Will only work for 2003 models. Allows you to reprogram for larger tires (up to 35") which make s a big difference, adjust shift points, 87 or 93 tunes, regearing. Only takes a few minutes to install and is fully adjustable. Performance program HAS been retured to unit and is ready to go. Comes with programmer, instructions and original box. $250 shipped!