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What Ethan said echoes the majority of my customers on feedback.... You can always switch to an K&N filter and try a "cat-back" exhaust after the fact to betterthe fuel economy... We have several guys here with the filter only and got at least 3MPG better...Thats after running the truck...

It assists a tremendous amount when it comes to towing and mpg while towing... For instance the difference between the 3.55 rear end and the 3.73 rear end is an additional 1,000 lbs. for towing with the 5.4 V8, and an additional 500lbs with the smaller V8... In my experience (having sold them...

You absolutely have to return to the original dealership who had it installed. Its not uniform as to what aftermarket components are added to a vehicle. The addition is likely one that was outsourced to a specialty electronic installation company that the other dealer is unfamiliar with. This...