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ajsalida · 11-16-2011, 08:12 AM

Just a wild guess but I'd think more boost/timing down low/mid on 91 & 93 octane. FMIC will be colder air & so less detonation risk but do nothing for absolute flow rate up top (higher RPM), like catless DP's would.

11-16-2011, 08:12 AM	#2878
ajsalida Colonel 226 Rep 2,387 Posts Drives: 95 M3, 02 R1150GSA, 09 335xi Join Date: Aug 2010 Location: SW USA iTrader: (2)	Just a wild guess but I'd think more boost/timing down low/mid on 91 & 93 octane. FMIC will be colder air & so less detonation risk but do nothing for absolute flow rate up top (higher RPM), like catless DP's would.
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