Integrated Engineering Recirculating Catch Can KitNote: Vehicles with charcoal canister mounted behind driver's side headlight will need to relocate this to install the catch can. See photo above. A catch can is utilized to capture 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