Review on FV333 Positive Crankcase Ventilation Valve by Nick Walker

Honestly I like this item but I actually get better performance using an unusually expensive Mitsubishi OEM part. I noticed that the holes in this part are larger than the OEM part, but I suspect the actual airflow is controlled by the design/dimensions of the components inside. I've tried two of these in the past and unfortunately the factory part works significantly better on my 3.0L V-6 (smoother idle, improved drivability, less ignition/spark knock).