I didn’t think the 04’s still had EGR. I deleted it on my 02, just removed the stuff and added a block off plate. This was required for the blower I put on it but the system is worthless anyway. If you go that way you’ll need to delete it in the tune. If you’re running a cam you’ll most likely need a tune anyway so you could just take care of both those. Blackbear Performance does my tunes through an Autocal I bought, data logs and tunes are sent via email and the service is good for as long as you keep the vehicle ie retunes for no additional cost.