I am looking for the codes to turn up semi truck engines. For example, Mack, Kenworth, Peterbilt, Paccar, International, Sterling, Caterpillar, and others.. Tweek the output here and there. Much more power can be produced if you can bypass the factory coding. These are a gold mine at any truck stop. Every trucker wants theirs turnt up - so the benefit of fulfilling this request is there.... I know of three standard protocols (J1587, J1708 ,and J1939) that are equipped on diagnostic devices. I dont know what all there is out there just had a buddy tell me he used to run it up at truck stops $500 a pop but he went to prison and no longer has the codes. Thank you for your time