On the Coates website, they identify the advantage
Post# of 3605
http://cumminsengines.com/tier-4-above-173-faq
Other industrial areas may not be as aggressive in their requirements (ie - India/China, etc) and this may be where Coates is suggesting they'll have massive emissions improvements. Also, they were comparing their test results against an engine without an EGR system (which plays a prominent role in emissions reductions).
I'm not calling Coates' claims untrue, but I think the basis for comparison needs to be clearly identified from where they get their figures and whether their system would allow the engine to meet the Tier IV requirements without the need for an EGR system. If yes, that is a significant win as EGR systems are costly.
There's certainly other areas where their system seems to be a significant improvement (fuel economy, reduction in number of valve train components, etc) from what their website details.
Regards,
-kbulldog.

