Jamie the 5 star is just a tune and the install instrument has the ability to diagnose and read trouble codes. You download the OEM code to the instrument then upload the tune via the under dash OBD plug. Its the rectangular one with about a dozen pins in it. I have the tune on my 2012 winnebago aspect, does civilize things as far as the rpm and transmission is. ALso helps with the dead throttle that they now have installed. You know its an electric thing and not cable or linkage activated, so now I have somewhat better throttle control with the tune. Ther may be a holiday sale coming up I dont know. I got mine when there was one and saves some $$. Mike does help if you have issues. Good guy.