I am a 17 y/o who just got an '04 ram 1500 5.7L Hemi as my first car. It's a beast and I love it, but it clearly doesn't get very good gas mileage. I've removed some extra weight, filled my tires to the max PSI, and adjusted my driving habits which has already saved me a couple mpgs as it is, but I'm looking to see if there's anything I can swap out or install that will help. All I've found so far thats promising is a k&n performance air filter and short ram/cold air intake system? Can anyone tell me if these are legit and if there are any other aftermarket parts that can help me out? Not expecting any crazy gains but every bit helps.