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Well since no one will post the link to that post, I suppose I'll give my 2 cents. Cat has been out of the over-the-road truck game since 2010. They didn't want to play ball with the emissions. I'm primarily a Cummins guy, but every manufacturer has had some good ideas. Cat's best idea regarding emissions was CGI, which stands for Clean Gas Induction. This is where they take post-DPF exhaust and put it through a cooler just like in an EGR system. I can only assume that they have a patent on this idea because any other manufacturer would be foolish not to take advantage of this method methinks.