Just got to a reputable shop to do a couple dyno pulls to see where I am pre and post JB4 install. Currently have a Injen intakes, custom mid pipe, and a magnaflow back. The shop owner is telling me he can do an ECU tune on the car and provide better performance gains than a JB4. I’ve told him that no one has fully cracked the ECU yet, but he assures me they can do it. And he will revert it back if I need to go in for warranty work. Should I believe him, or is he blowing smoke up my ass?