I have a used HPP+ with a power tuning cardridge for sale. The cartridge is used ofr tuning with headers/cam/and supercharger. Hypertech said the cartridge works well with the cc305 and LT4 hotcam, as well as headers and superchargers. I have all of the original boxes as well as the instruction book. The HPP+ is the same as the HPP3. This is for a 96-97 5.7l F-body. The power cartridge was $250 alone, so I would like $250 plus shipping for both the cartridge and the HPP+. Feel free to ask any questions, I am getting rid of it because I chose to go with a mail order tune instead. Thanks