I disagree a little. 62mm S/C pulley could require more fuel and monitoring. A 65mm s/c pulley will work just fine without the extra fuel and monitoring. Any cold air intake will gain you HP, but the dual Needswings is what I like and run. You will need the tune after these installs to bring them together. There is always someone selling something on here less than new price. You just have to shop and be patient. I have bought a few things slightly used. But, that is up to you. I like to know what I am bolting on is in like new shape, so knowing the seller helps. Good luck.