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advertised w? 4.0 I6 MPI but KBB says SFI...what's the dif?

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Old 11-04-2011 | 11:14 AM
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jacknthebox
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Default advertised w? 4.0 I6 MPI but KBB says SFI...what's the dif?
Should I be concerned that there is this discrepency....and what do those letters mean?

Thanks.
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Old 11-04-2011 | 11:50 AM
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I am thinking mpi is multi port injection not style of the other one
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Old 11-04-2011 | 11:55 AM
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Ok that's right and sfi sequintial fuel injection
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