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all the xfi models had ms in the vin instead of mr so if the car came factory with the xfi cam and gears then the vin will show it.
Measuring the cam is probably the easiest way to see if it currently has the xfi cam. lobe height can be measured through the oil filler cap. The numbers are floating around somewhere for it but I can't seem to find them.
As far as I can tell the base metro cam has been the same for the 3 cyl:
Lift/Duration at .050"
85-87 1.0/3cyl 330 /192
89-01 1.0/3cyl 330 /198
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