I don't mean to be a spoiler here but, ............ 
CFM doesn't mean a whole lot, in fact it doesn't mean squat unless you also include temp. delta's(inlet vs outlet) at various pressures......efficiency.
I'd rather have a 600CFM IC with a 95% efficiency than a 1000CFM IC with a 80% efficiency.
__________________
Dave
'85 930 Factory Special Wishes Flachbau
Werk I Zuffenhausen 3.3l/330BHP Engine with Sonderwunsch Cams, FabSpeed Headers, Kokeln IC, Twin Plugged Electromotive Crankfire, Tial Wastegate(0.8 Bar), K27 Hybrid Turbo, Ruf Twin-tip Muffler, Fikse FM-5's 8&10x17, 8:41 R&P
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