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It's a NOX decal that came in a kit to reduced the vacuum advance.

You were EXEMPT from having to install the kit if you you had multiple carburetors or cold air induction.



My parents '70 olds vista cruiser 350 4bbl has an exempt sticker on the window. It does not have multiple carbs or fresh air. It never had that nox equiptment on it.

Where there other reasons or certain years that gave you exempt status?

Just pointing out exempt sticker is another emmission related sticker you can find on CA cars of that era. Yes, exempt sticker gets you out Nox equiptment.



Those two reasons were the only ones I remembered from the list that CARB had in the NOX manual. I don't know why a Vista Cruiser would be exempt.