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On the 200 and up 3100 there are 2 federal option codes nf2 and nf4. What do they mean and what are the differences
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NF2 : EMISSION SYSTEM, FEDERAL, TIER 1
Thats the only one I found, I don' know what NF4 is though...1995 Grand Am GT
3400 V6 / 4T60-E / Engine Swap
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NF4 EMISSION SYSTEM CLEAN FUEL FLEET
4+4+2=10 for Oldsmobile
96 Cutlass Supreme SL IV
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