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since you already have the flex fuel sensor, the next logical step is a "stage 1" hpfp if you stay stock turbo. then you'd be able to use the stage 2+ map which is a significant bump in power and run any amount of ethanol you please (with increased power).
go "stage 2" hpfp if you plan to upgrade turbo.
popular brands of hpfp: dorch, spool, xdi, precision raceworks
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M235i rwd 6mt
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