So, it looks like Nissan is stepping up their game with this beast.. 12,000lb towing capacity is nothing to shake a stick at!
http://www.trucktrend.com/features/n...ssan_titan_xd/
"One of the main differences between the ISV5.0 and this engine is the new Holset M2 Two-Stage Turbo system by Cummins Turbo Technologies, which was developed in the U.S. and U.K. specifcally for Titan XD. The compoundturbocharger setup is mounted in the valley of the engine and utilizes one small turbo and another larger unit in series. Helping them work in tandem is a wastegate system with a patented “Rotary Turbine Control” valve that operates the opening of ports during four main operating modes:
1. Low-Pressure Single-Stage Turbo Mode
2. High-Pressure Two-Stage Turbo Mode
3. Wastegate Mode (maximum engine power output)
4. Regeneration Mode
This system is designed to provide minimal turbo lag in all driving situations while maximizing the effectiveness of the emissions controls for clean operation along with good fuel economy"