Hi Fuzzy Bear. I have an '03 HO, 3500, 4X4, 6-sp. , also. I've done an AFE Proguard-7 air intake system and a 4" exhaust system. I've been seriously thinking about the BD Power Pup and since You have one, was wondering how You like it? I would really appreciate Your opinions. I, also, have the BD X-monitor Pyro and boost guage. Thanks, for Your help, Fuzzy Bear. Joe F. (Buffalo).