Has anyone figured this problem out yet??????? I installed cat-less down pipes and didn't have any smoke, once I deleted the mid cats the car started to puff smoke on deceleration and when at idle. I also notice large puffs if I don't rev match when downshifting but nothing at steady or wot. It smells of oil and only starts when oil temps reach 210. There is no noticeable performance loss, car runs amazingly strong. I have since then replaced turbos and valve cover gasket (did find the front turbo to have a bad seal). Several days after the new install the smoke comes right back. I am fbo+ meth, occ, and rb pcv. before I installed the occ there was a thin coat of blow by in the charge pipe. I also noticed that the crankcase vent tube's check valve does not fully close. When I removed the turbos there wasn't a lot of oil build up on the the wheels nor was there a lot of blow-by in the IC . The plugs are have a slight redish brown tint. Only cells that its throwing are O2 efficiency banks 1 and 2. I see that many people have had this problem going back as far as 2008 but still no solution besides put the cats back on to cover whatever the problem is. I just want to get to the bottom of this for myself and others.
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