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the 2006 order guide prints it as "NEW! Smart Select Package discount not desired", as R91 on p.126 and R9I on p.118
GM Heritage factory kit — 2006 Chevrolet Tahoe, p.118, p.126.
R91 Factory-verified
Documented applications
This page aggregates every documented appearance of R91 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.