I run B100 in my truck with the tunes all the time in the summer and it runs fine. There is a very minor difference in power and fuel economy but it has never hurt anything. I asked Bill about this once and he said it was not a big deal. He did say he could write some custom BD tunes but needs to know the source of the oil, corn, conala, pnut, etc.
As for the stock thing you can just pull the chip out and it will go back to stock. Cody correct me if I am wrong but the chip just overides the trucks computer it does not actualy put anything on it.
I also am in CA and have not ever been approached on smog. If you are ever in the Sunnyvale Area (San Jose) and want to see how the tunes are in my truck let me know I would be more than willing.
Joe
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 2003 4x4 F350 Super Duty Crew Cab Short Bed
4" Down pipe and exhaust, Wicked Wheel, Modified Exhaust Turbo Housing, Big Head Waste Gate Actuator, PML Transmission Pan, Factory Tech Valve Body, Autometer Gage Pod, PHP FU2 Chip
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