I need help. I'm putting in a quadzilla adrenaline in my 2004 cummins and I can't find the data port in the engine bay

Should be in between fuel rail and master cylinder for brakes ziptied up on firewall with wire harness with dummy plug in place

you get it in and all hooked up let me know how you like it thanks

Mine have all be close to the fuel filter. 

Usually close to the ECM on 2004. Should be a plug with a plug cap on typically.