Model conversion, up level version

Years 2005–06 Models 1 Factory citations 2

Also documented for Buick Chevrolet Saturn

Documented applications

Montana SV6 — Second generation, U-body (2005–2006)

2005–2006 Factory-verified

GM prints Y9I with a letter I and Y91 with a digit one, a different part, so both stay

GM factory document — 2005 pontiac montana sv6 rpo code list, p.1.
GM factory document — 2006 pontiac montana sv6 rpo code list, p.1.

This page aggregates every documented appearance of Y9I in the Pontiac reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.