Your options are as follows...
JWT or Stillen Pop Charger, which is basically a large cone filter and a special adapter that attaches it to the MAF and allows for smooth airflow into it.
Pop charger...
There are no traditional "intakes" for the 2000+ cars. Meaning there is no company which makes a pipe that goes from the throttle body to the MAF w/ a filter on the end. Weapon-R did make one for the 99's but they will not fit the 2000+ cars.
Hotshot and Stillen make cold air intakes for the 2000+ cars.
The Stillen one is not a full intake, it starts at the MAF so the stock rubber piping before the MAF is still used.
Stillen cold air intake..
The HotShot cold air intake is a full intake, meaning that unlike the Stillen, the Hotshot replaces the rubber piping going to the throttle body in addition to the cold air part.
Unless you want a cold air intake, go with the JWT or Stillen POP Chargers. They provide 3-4hp at the wheels just like any other intake..