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I can only relay experience with OFT.
I've been running the off the shelf stage 2 E85 tune for around 4 years. No issues whatsoever. The car has been thrashed in hillclimbs regularly and is competitive.
Flashing between 98 and E85 is a five minute operation but you do need to run your tank down close to empty first.
If you have a source of E85 that is between 60 and 90% ethanol then OFT is all you need. You do not need flex fuel. (Do a google search for how to fun E85 with no flex fuel on an OFT.)
Worth mentioning that catbacks, axlebacks add almost no power (like low single digits)
Sent from my SM-G973F using Tapatalk
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