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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,167
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MFI is not measuring air flow, whereas CIS does. This makes the CIS perform better from fuel/air metering POV, But... on higher output engines, the cam timing has overlap . . which induces bad flow at certain rpm ...which confounds the air flow measurement. -a modal thing.
So, yes; "much inproved CIS fuel injection" . . but at a cost of a more broadly rev-range tuned motor.
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong.
Disclaimer: the above was 2¢ worth.
More information is available as my professional opinion, which is provided for an exorbitant fee. 
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