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Correct, you need an FF kit to allow the FF tune to work properly. Not sure if it works on OFT, since I purchased the EcuTek knowing it would be upgraded early on. The kit allows the engine to be 'upgraded' in that it can actually use E85 appropriately. Then having a proper tuner go ahead and tune will get you the largest gains. Generally speaking my '17 came stock with 170bhp at the wheels. With the header, exaust and FF I dynoed at 200 at the wheels. So that's a snapshot picture for you. Obviously the dyno allows for more accurate tune than a flash tune OTA. Hope this helps!
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