I am currently running edge/juice on level 1 may try level 2 but have no need to as these dmax's have all sorts of power. Run an afe replacement filter in a swiss cheese airbox. I basically do not tow this is my daily truck as I farm and this is what I am in, fuel tank in back and drive fast from field to field. Question is do I need to upgrade exhaust or can I run stock exhaust or possibly just put in less restrictive muufler in stock exhaust and not have any problems? Do not want loud system at all. Thanks.

You'll be fine with stock exhaust.

stock exhaust will be plenty for your needs