I've gotten MAJOR blowby since going IRTB. My catchcan caught about 1.5 qts in about 70 miles. Had some blowby when I was turbo'd but not like this. I capped off the PCV, so I'm thinking that's the reason why. I'm thinking of running a hose from the pcv to the catchcan and from the breather vent on the exhaust side to the catchcan as well. currently the catchcan has a line coming in from the breather vent into the can and vented to atmo via breather.