doing the injector slope adjustment is the same for the predator and the trinity... modify the tune, change the setting, reinstall the tune, etc...

there's a full write-up on the site on how to do it...

as for "their custom tunes", diablosport does not do custom tuning... they have a network of diablosport CMR custom tuners that provide custom tuning services... which is why custom tuning costs you extra.. .it's someones business doing custom tuning... it's not diablo doing it for you... do you work for free?? heh...