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May have to do a set of heads , if I end up needing to replace them what are the best shops out there to either get a set or have mine worked?

Hi everyone , I'm new to the forum and to the 6.4 so bear with me if I ask some silly questions . Not long after I bought the truck I did a dpf delete , spartan tuner and a s&b intake to attempt to gain some fuel mileage and save the motor from the EPA retarded regen process . So far the tune...