You can start with the simple stuff first.A better air filter, that will help the engine breath better.Second,the exhaust,do you still have a warrenty on the truck?If not you can just get a good exhaust system and that will help the engine get rid of the exhaust easier and you still should be able to pass the inspections.As for the egr, thats your call, but i personally don't like them.As for the programer,you should get one that has the temperature desplay built in to it.
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