I have an 04 Quad Cab 4x4 2500... I have been running the Dr. Performance Stage II for quite awhile now. . I"m now looking for more performance out of my truck. . I am about to break 70,000 miles... I am wondering what others have found that works with towing and play... exhaust systems, modules, etc... . is Banks just the best out there or are there other good options? for the exhaust... 4 in. better or is the 5 in. ? turbo or cat back better? as you can see... I have many questions... I"ve seen what can be done with a diesel... and now I want to find out what I can do with mine with the money I have on a fireman's budget. Thanks to everyone that takes the time to help me out.