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    Fuzzy match across codes, option descriptions, and model aliases. Every result is graded and, where the factory documents it, cited.
    NM5 Factory-verified

    Chevrolet · Regular Production Option

    Emission system, Canadian

    Years 1993 Models 1 Factory citations 1
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    Also documented for Pontiac

    Documented applications

    Corvette — C4 (1984–1996)
    • 1993 Factory-verified internal

      1989 is not claimed: only the preliminary 1989 engineering and product-direction pages print it; 1992 is not claimed: only the preliminary 1992 product book pages (GM confidential, 1990) print it

      GM Heritage factory kit — 1993 Chevrolet Corvette, p.18.

    This page aggregates every documented appearance of NM5 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.