Hello. I have a 2001 2500 automatic with a Smarty, S&B intake, shift kit, torque converter and a 4 in exhaust. I have been searching the forums of TDR and I have found a lot of information about Air Dogg vs FASS and locating a stock pump on the frame rail vs leaving it on the engine but i can not seem to find any information on which model of lift pump people prefer (model of air dogg or fass). I have looked at GENOs and Diesel Manor and both offer many different models. I would like to get a reliable pump that will be able to keep consistent pressure with the modifications I have. Any one have any suggestions. I apologize if this information exists some where on TDR but to date I have not found anything. thanks in advance.