No supercharger kits come with fuel upgrades. They all claim can run stock fueling with 93 on their canned tunes.
Far as fit and finish. Well they both are good imo. On the C7Z kit there was one PCV line that had the wrong quick connect fitting. Other then that pretty good. Whipple finish is much better. The Maggie already had a scratch on snout right out of the box.
https://youtu.be/7-ibiZchido