You are in California right? Plugging the PCV probably isn't an option for you. That's the only way to keep the intercooler totally clean. I had a catch can and the pre filters and my intercooler was still gunked up.
Yup and I even sprayed water/meth.... lots of it and mine still gunked up like mad. I was hoping spraying gallons of w/m though there over time would clean it but no such luck. The only way to keep it clean is to completely eliminate the PCV and the oil getting in there in the first place.