Well, I'll definitely keep that in mind with the KN filter. As for the plethora of options available, I'm definitely aware of that, as well as it being a matter of preference. What I'm looking for isn't what the best things are, but more, what will stretch the dollar the furthest in upgrading the vehicle. For instance, putting in a new stereo system isn't really a priority, and could cost hundreds to thousands. I'm wanting to know what's the best choice to do first, tires? upgraded suspension? outside enhancements? (such as brush guard, new grille, etc.) I just don't have a lot of ideas on how much everything costs, and what I should start with. Any suggestions on what kind of spark plugs also? I read somewhere that fuel performance can be improved by changing the air filter and spark plugs. I'm getting about 15-16mpg as it is right now, just city and highway driving.