I have a U7137 for a Dodge Ram, and now I want to tune my 2010 Camaro SS. Do I pay for and request a custom email tune, or do I turn the whole thing back in for $99 credit on new hardware?

b/c of the elevation level, we only have 91 octane. can i still use the 93octane setting on Predator?

would it be the same, since 91 is more powerful at higher elevations? or do i have to go with the 91 can tune?