Yeah they had the rubber washer on them, it smoked b4 the cam kit was fitted same blue smoke, then a few weeks later it started again, so i changed the turbo, as my old one was only a standard one and been on since new! and had so much play in it that the blades were hitting the casing!. My CO is 3.5% at the moment, think thats ok as i didnt want it to run lean.