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most local dealer mechanics don't know what they are talking about. PM 05LLY (moderator here). He actually had the stuff installed on his truck. Blocking the EGR valve stops exhaust gasses from entering back into the engine. I would call BS on this. You will be running higher boost with the PPE programmer so your EGTs should go down. I would still install an EGT guage though so you know how hot you are getting.
 
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