Hello new to this forum but have a couple question that i kind of know the answer from reading other posts but not sure. I have a 2002 f-150 crew with a 5.4 2v that loves its fuel. I put a k&n instake on and a magnaflow cat back highflow exhaust on it. I did get better fuel economy and more go. I ended up buying a edge evo cs tuner for the truck now reading my questions are do i need custom tunning for the truck because of the adons and the fact im getting worse fuel economy with the tuner. I also dont want to damage anything because i tow a bass boat and car trailer with the truck. And info would be appreciated.
