I just received and installed my RamAir filter yesterday and I'm very impressed so far. When i first opened the package, I noticed the "RamAir" logo (which was painted white) was very sticky, like it wasn't all the way dry or something. I just figured "well maybe it will just catch that much more dirt and such."
For those of you wondering about noise, I was very pleased about the amount of turbo "whistling" I gained (mostly with the windows down) and the diverter valve was muuuch more present. Judging by the sheer size of the stock air filter, it made sense that it was used as further sound suppressing. If you are on the fence about buying this filter, do it. If you want to keep your stock airbox-type set up, buy it. Even if you plan on upgrading your stock set up, I have to believe this is the way to go. I've always used an oil-type filter in the past but i'm now a believer of the foam style. When I replace the pipe and the bottom half of the air box, I'm hoping to get a little more induction noise (I want it to sound like a turbo car without being obnoxious) and I'm very happy so far with my set up.
I also wanna give a big thanks & shout out to Ron @ Whoosh Motorsports. Very nice guy and hope to do more business with him and hope other FiSt owners do too!