[Jeff Chambers]

I wouldn't cap off the coolant lines to the EGR unless you plan on disabling the EGR all-together. The coolant lines provide cooling, albeit a small amount, of the EGR flow into the intake and also help limit the heat soak of the intake by the EGR flow. If you plug the EGR passages at the heads or in the lower intake, then you could disconnect the coolant lines. Otherwise, leave them in place.

FYI. I removed mine, but only after plugging the EGR passages in the lower intake. The I eventually got rid of the EGR spacer all-together with a UPR EGR delete plate. I also shut the EGR function off in the computer so that I don't get any Check Engine lites from the EGR selenoid being unplugged.