Remember the N54 utilizes direct fuel injection so the intake track is dry - all the way through. Not sure how that will inhibit the use of methanol, but the flame front of the cylinder head is predicated on the spray pattern of the direct injector. If you start introducing another source of fuel into the intake track arriving in a manner that isn't accounted for (in a place it shouldn't be), all bets are off - it will cool the intake but who knows what impact it'd have on the fuel burn process. Suspect there'd be easier gains with an uprated intercooler to be honest. Just my $0.02.
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