I did this mod yesterday, and normal driving, I never hear it. If I try and act like my car is a manual and snap my foot off the gas, I can barley hear it. If I roll the window down, and turn the stereo off, its "ok".
I think it must be a comparison gap, when people say they can hear the turbo spool due to an intake on these cars, or how loud the stock BOVs are, I don't think you guys have owned a car with a bigger turbo. My last car was a 2010 Genesis Coupe turbo, that I did a big turbo on, bigger fuel system, and the works, and that turbo you hear spooling up over a loud stereo with the windows up, and the BOV could be heard for blocks away.
I think im just going to take my caps off, and return the car to stock. Since I didn't even hear the BOVs once on my 45 minute trip to work, I don't see the point.