I ran E85 on my RA with the stock fuel system. It works fine BUT You might want to replace the fuel pump because mine stopped going into high voltage mode after a year.

Definitely use a wideband when doing E85! It has a much higher knock threshold. Logging regularly helped me avoid problems with lean AFR.



Mods:

EVO X IC and pipes
EVO X intake
3 port
Dual Map tune
HFC
Synapse DV
DW300 fuel pump w/ Ultimate Racing adaptor.

 

E85 Rocks Info is in my sig