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I have a 2000 gmc 1500 with the 5.3. I ordered a egr block-off plate, and exhaust manifold and intake manifold plugs from route 66 mods. I've heard of people deleting the egr value of gasoline engines. I'm not doing long tube headers, its my truck that drive every day and pull a trailer with and I'm gonna get big wheels and put a SS badge on it that just looks stupid. I looked on the other forums about deleting the egr on the 5.3 and all there is a bunch of guys arguing about what to do that haven't even done it them selves. I don't know if I'll have to have it re-tuned or just clear the code? I hope someone on this forum has done it and knows what to do.