i have the HKS SSQV on my car and i dont have any idle problems or CEL's. It does take a bit of fiddling with the adjustment screw on the back but its easy to do. It is loud, a lot louder than the worx or GFB but i dont mind. it is also 100% atmospheric though.

 

i want to get the hks but i want something to help with my idle problems and running rich. that is why iv decided between the worx or gfb. I have the RFL and i love how loud it is but i am having problems with it. so a new bov is my next purchase.