As some of you may know, the '14 L83 were all standard with Flex Fuel Capabilities. The '15's made this an option.

I just picked up a '15 and got a great deal, but it didn't have the Flex Fuel capability.

I believe it's as easy as ordering the sensor and enabling in the tune, but may be more of a challenge. Any help appreciated...

 

different injectors?

 

Someone did the conversion on a 6.2L a while back and posted on here, do a search, they had to add the alcohol sensor and turn it on in the tune, not sure what else.