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I have a 2004.5 lly duramax that hasn’t had an egr delete and I didn’t know if I would have to have it retuned when I do the delete.
 

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If you block it, it most likely won't throw a code. IF it does and you're not looking to tune the truck you can get a "fingerstick" off ebay for 75.

If you completely delete it you might need a tune.
 
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