I have the Turbo Smart direct fit to the intercooler. I like it a lot. It is an Austrailan product and it is built very well. It is adjustiable and sounds great. You can almost tune it perfect by sound. I got it from ISR or autocaresubaru.com ask for wrxgirl one of our club members to hook you up. I think it cost between 150-175 american dollars.
I have GFB BOV and............ I dont quite like it. I hate especially when you are not on full throttle it would have a stuterring sound as if it does not vent properly. I cannot argue with the sound when its on full boost. But I am planning to upgrade to Blitz DD or HKS SS, just need to do a custom job .
Well, my first impression of the GFB was "wow, nice," until I heard my friend's Blitz DD............. just pure difference.
Give and take I suppose, GFB was a lot cheaper for me