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It is a good idea to install one on any direct injection motor, boosted or NA. The reason is the injectors are not spraying fuel on the intake valves in a direct injection motor. The fuel cleans/prevents the oil/carbon residue from building up on the valves.
The PVC system is necessary to vent the blow by pressure build up in the crankcase. In the old days they just vented it to the atmosphere, but emissions laws are different now, so they plumb it back into the intake. This worked for years and then the direct injected motor became popular. As miles were put on these motors, manufactures started having issues with carbon build up on the back of intake valves. This is why they are trying to filter/improve the PVC systems now.
Over time a direct injection engine will have carbon build up on the back of the intake valves and this will affect performance. Adding an OCC will help reduce this from happening.
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