Having oil buildup issues in the air intake system? Duramax vehicles are designed to use the air intake system as ventilation for the crankcase system. This can leave behind oil contaminates, leading to poor performance.  ICT Billet offers PCV plugs and adapters to custom design a PCV system reroute. Manufactured from premium aerospace grade USA 6061-T6 billet aluminum for a durable product that will not only last, but clean up the engine bay as well.