Hello, I'm new the the site with a 4x4 5.9 2000 quad cab which I have put a great deal of work into. Interested in Modifications for gas mileage and improvements in towing ability. So far I've added CAI and HHR fan and plan to upgrade the exhaust and add a tuner. The truck is used to tow a 20' bass boat around the Ozark hills of Missouri and Arkansas.