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Most of the gains of cheap headers is with the removal of the precat, so I doubt the larger/better MY17 headers are equivalent. An expensive Ace 4-2-1 header will be better still.
To run E85 you will need injectors, flex fuel sensor/kit, ECUtek or some tuning software, a tune, and if you want to be proactive/safe, even if it is probably not necessary, upgrade the fuel pump. If you go ECUtek then you need the key, their obd2 dongle, a license and then the tune, which all in is around a grand, so you can expect to pay $2-2.5k for everything then if you want to add a header then add $500-1500.
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