LS2 GTO tune

[dieselturbo16]

hey guys, I'm an diesel tuning guy and I have a buddy who wants me to tune his GTO...unfortunately I have no idea what I'm doing on a gasser, does anyone have a tune for this? he has an intake, exhaust, getting headers and I think thats about it, he said he doesn't expect to much more out of it but i'd like to prove him wrong hehe :D if no one has a tune could you guys give me a hand figuring out what to alter?

Thanks,
Greg