This is my Go Fast Bits (GFB) FX Stealth BOV that came with my Evo IX. It has a few other mods which were on the car as well. Granted, the sound is amusing for a period of time (kind of like the whine in my supercharger), one of my first mods was to find a stock IX BOV which I have an plan on installing this Spring/Summer. I've read quite a few threads about aftermarket BOVs for the IX, so I opted to go the stock route.