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Usually takes pliers. Rotate counter-clockwise to remove. You still may have to pull up once it's released. I see Hammer's has the ramp to help remove the unit. My '03 doesn't have that, but my '06 C does. The EGR is usually on the front of the motor, passenger side.
mine appears exactly like hammer's. i'll give it a twist and pull. have never seen PVC's configured like these (im a GM guy for the most part). I have no idea what this PVC should look like. hopefully it will come out in one piece!