Those are pointless IMO... not only do they suck in hot air, but they also don't remove the biggest restrictions (screen, baffles, indirect airflow in the box)

This is the most effective one out there, by far:

NeedsWings Crossfire Naturally Aspirated Cold Air Intake System

The dual version is overkill on the N/A motor, so the single intake linked above is perfect. If you can't afford one new, you will see them pop up from time to time on here used for $250-$300.

This replaces the MAF and lower elbow entering into the throttle body as well (OE MAF sensor plugs into the NW pipe), so it's a true 3" intake from filter to manifold. No other intake comes close on this motor. Several people have made their own version, but by the time you buy a good filter, mandrel bend the pipe, teflon coat it, weld a bung in to accept the MAF sensor, and source the silicon elbows and all clamps and 3" radiator hose, you will have spent similar money for a worse looking product.