Do you mean the multitude of posts both on this forum, Facebook and so on, complaining of burning oil/exhaust smoke after fitting? Specifically at idle and on over run etc. (Vacuum). It's caused by forcing both crank and cam gas pressure in to the intake pipe via the tiny recess in the back of the plate. The R-Tech kit only channels the cam area pressure through this route via a much larger recess in the plate, whilst the crank case pressure is vented elsewhere.