Do I need a Gryphon - What tunes are included?

[66gtk]

Thanks for your help - Regarding the current state of tune. If it does have a non-stock tune installed, Do the custom tunes work on the premise we are starting with a stock tune? If so, how do I return my vehicle to factory stock before I start messing with things?

When I purchased my truck, it had 40K miles, and almost new looking factory tires/rims. Makes me think the PO put on aftermarkets, adjusted the speedo accordingly, and returned to stock wheels/tires when the lease was up???