sorry to be so brunt about this, especially if you havent quite learned to search around a bit here cause ur new
but the cheapest way of getting some power would be to park in your driveway and buy a poster of what it would look like driving fast and stick it in your window. Anything that's like a chip or something that claims to help you is total b/s...
there are some easy things you can do to notice either increased MPG or HP or both that arent bank breaking, so look around a bit, search, and you'll come up with some stuff!
Any of the basic naturally aspirated engine mods that allows for free'er air flow to start