I have one. First off it does not include the filter. I got mine on ebay for $40.00. That will save you 10 bucks if you ordered it from someboby like Jegs. Second, it is loud. You will hear a lot of stuff that you didn't hear before. However, after the car warms up, the only time you will hear it is at WOT. WHAAAAAA(that's the sound). The flow is excellent. I don't know what mods you are running but if you have a smaller than 3.4, then a CAI is a must. A 3.4 could use an SLP CAI with a K&N and the downpipe/ubend replace. It is a lot quieter than a Wizaired, MSP, or Thrasher. Of the four CAI's, the Wiz is the best. The Thrasher and MSP both look a little better, and the SLP looks kinda stock. The SLP is at the bottom, performance wise, but better than your current set-up. I hope this helps you. If you have any other questions, please ask.
Jack
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JackO
2004 GTP CompG. WS6, 3.29 axle, HUD, tapshift, Premium sound, XM radio, leather, sunroof, 17inch 5 star chromies, BFG Comp T/A. Wizaired CAI.
Traded in. 2003 GTP. Every option but HUD. New Mods: Wizaired CAI, SLP Headers, Cat, U-bend and Downpipe, 3.2 Modular Pulley, Phase 3 rollers w/OR Pushrods, Larger Belt Tensioner Pulley, Gatorback, AL103's, 180 Degree Stat, DHP