Welcome,
Will you definitely need custom tunes with the CAI. As for which tuner I would say it is up to your preference,...Bill will be able to change the air/fuel on either one (gryphon /sct). But as far as the O2 sensors you would have to talk to Bill about that and see if he can turn the light off or bypass....
I am pretty sure you are gonna have to have a stock tune before you can put another tuner on the truck. I am not sure, but I would think PHP could fix you up with this.
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