I'm running the AirRaid in mine and I love it.
If you plan on doing any off-road though, get the bags for it. I made that mistake once, had to replace the filter.
The AirRaid uses the stock pipe and the filter box. Takes off the lid of the box and Replaces it with a metal surround.
Really easy to install, took me about 5 minutes. (mainly because I pulled the factory box out THEN relized I needed to leave it)
The gains weren't hugely noticeable but the sound increase was great.
