Integrated Engineering | Recirculating Catch Can Kit (VW MK6 GTI/Audi A3 8P)REDUCE CARBON BUILD UP AND OIL MIST. A catch can works well to catch all of the oil fumes that are omitted from the valve cover breather, removing the faulty factory oil separator in the process. This not only removes the oil mist that is found everywhere but will greatly help reduce carbon buildup on the intake valves, a common problem on TSI engines, which relates to power loss and poor drivability. Our kit includes the necessary valve cover