DO NOT BUY THAT ONE FROM PROCARPARTS... That thing is over priced and doesn't really mount right. Here is what you do and what you need:
Remove old air box.
Buy a 3in K & N Cone Filter ($30-$50)
Buy a piece of plastic elbow: one side is 2.5in and the other is 3in. (Home Depot, $2)
Buy some colored hosing or black ($5 home depot) to fit over the air-flow sensor and the vaccuum hose that usually go into the air box.
Then on the elbow drill out 2 holes so you can fit the hoses into it.
Attach filter and clamp down elbow into plastic tube from air box that comes from throttle body.
You have yourself a nice intake, improved sound, minimal horsepower (none really give you any) and cheap. Grand Total: $37-$57
Good luck and any questions please IM me!