First of all the "how to" is extremely simple -
http://www.peachparts.com/shopforum/diesel-discussion/355250-sale-egr-delete-block-off-plate-kit.html...just get one of these. If you've ever had the pleasure of cleaning out an EGR infested intake manifold you'll understand the why...as they say, "intuitively obvious to the most casual observer". Almost all EGR systems are clogged so replacing the "clog" with a "kit" is a net break-even from the perspective of emissions.
One of the more interesting aspects of active forums is the emergence of "single issue" posters.
Some people like to raise the issue of "legality". In a world where there are so many laws, it's physically impossible to not break many, often without even knowing, EGRs fall so far down on the list as to be unmeasurable. At a time when our leaders flaunt the laws on really serious issues like following the constitution, maintaining security, bribery, sanctuary cities, illegal aliens, and on and on and on, I don't have a problem in following the example being set on insignificant and irrelevant technical violations.
Bottom line - if you're an EGR fan, great, go for it...and if you're not, fine too. Make your choices and live with the outcome. And of course respect dissenting views.