[Dantesboyz]

I don't recommend a flex fuel kit
Kern417 touches on this in one of his flex fuel videos too.
Essentially you'll lose one of the advantages running ethanol gives us as tuners.

Some of us with ethanol tunes and $hitty local 93 actually need to run a higher percentage of ethanol in the mix than the map targets for knock protection.

For example I run an E45-E47 mix on E40 map in MHD per recommendation of MHD. If I run eE40 on that same map, I get noticable timing pull on all cylinders.
Running the higher mix will clear it up, or yield negligible pull on one or two cylinders.

To each their own, I'm a bit OCD, I have the Spool analyzer to watch my ethanol content, yet i still least measure the ethanol content of the e85 out of the pump at least once a month.