EGR Disable vs.ĮGR DeleteWarning: Emissions tampering is unlawful on any motor vehicle used for on road purposes in the US.This Tech Tip has been written in an attempt to educate and minimize time spent on the phone discussing something that shouldn’t be so complicated. If somebody has a dumbed down version of how the EGR actually works that might help too.Duramax EGR Blocker vs. Good read for anybody just getting into this stuff, from Kennedy.