HARD Motorsport - BMW E9X 335i Oil Catch Can KitHARD Motorsport Oil Catch Can This is a must have item if you run high boost on your N54 or if you plan to be at the track. Prevents oil blow by that coats your charge piping, intercooler, and throttle body effectively keeping everything nice and clean. One of the best features is that it prevents carbon build up on your intake valves and increases performance. Mounts to your stock strut brace for an O. E. M. look. Features: Prevents carbon build up