I suspect we can thank the EPA for some stupid reg. that prevents the importation here. http://www.autoguide.com/auto-news/2011/09/new-chevy-colorado-confirmed-with-duramax-4-cylinder-diesel.html But wait, there/s more! http://blogs.dieselpowermag.com/6775965/diesel-engines/gm-opens-4-cylinder-duramax-engine-plant/index.html