yes mate thats why im asking you , i use the open loop on a grs oil seperater , all it means is that you make a catch tank then the crap oil doesent go bach into the system , works fantastic on mine and never hunts at all, this is what you do ..block the pipe that come out of the metering head then make a catch tank for the pipe that comes out of the oil seperater, normaly crap oil runs into the bottom of your metering head , if you see how much oil comes out of my catch tank you wouldent beleve it mate ..will put some pics up .. and this is thanks to karl from n.m.s who sent me a email were all the pipes should go the dff is amazing

andy