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no , a flex fuel kit allows you to run 91 to e85 without adjusting your map(it selfs tunes base on the gas-ethanol in the tank). The stock lines you can run full e85 to 91.
Im assuming your on boot mod3 ? mhd gos up to e40 on stg2+ and full e85
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2018 340i - MHD CUSTOM TUNE, PURE850, DORCH STG2.5,MHD-FLEX-FUEL, M-PERF LSD, XHP Stg 2, CSF Heat Exchanger, M-Perf EXHAUST Mid Pipe BACK, Ross Racing Oil Catch Can, Evo Race Work Downpipe, PURE Inlet, DINAN Intake, VRSF Chargepipe
2011 335is - SOLD
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