George, Apparently, your state does not require a NOX test. NOX is what the EGR affects most. The low compression DET won't produce as much NOX but the stock DE needs EGR to pass the california test. Mike --- George Roffe <geo3@earthlink.net> wrote: > Just wanted to add yet another data point out there > and again confirm that > a DET can pass emissions w/o running EGR.....