Take off the front bumper and take out the stock resonator(passenger side),plug the vacuum line at the intake manifold, and drop in a k&n filter in the stock location. Just leave the stock air box and it will pull cold air.You'll drop a few pounds on the car and free up some Hp. Best of all much cheaper than buying a $140 short ram or more expensive cold air intake. Also don't jump at getting a header if you aren't sure about going naturally aspirated or with forced induction. If you go naturally aspirated you want a nice header and cat back exhaust/high flow cat. If you go with a turbo you'll need a special exhaust manifold specifically for your car however if you go supercharged you can retain the header. Also the intake will vary depending on the application, if you go N/A you can use stock or after market cold air kits , but with FI you need a slightly modified setup for optimal gains.