I've asked the same question, a lot has to do with the placement of your fitting. First I had it on the passenger side front top surface of the valve cover without a baffle and with a baffle it sucked a lot of oil, I could not drive 100 miles without it blowing oil out the top of the catch can all over the engine area and down the side of the car all the way back to the bumper. We drove down to Phoenix cruze-in and a guy walked up to me said he liked the car except the block (MR1), can't think of his name but he dose the IA blocks, so he said the best place to place the fitting was the vary top center of the valve cover. I did it with no baffle and drove 100 miles and I drained only 3 oz. of oil out of the catch can which is plenty to keep the pump lubed so I'm happy with that. I can't get the pic to copy here.
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