Bigger injectors and bigger fuel pump will be needed IF you run it at WOT.
You need to remap for e85, wether you use new injectors or not. Fueling and timing is different. If you cannot do it yourself, there is not much point doing it now.
What you could do for now is use a little ethanol mix to clean your fuel system before switching to bigger injectors and new pump. The car may run a bit lean so no WOT either ... 20 - 30% mix is ok.
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