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thats what i thought also but looking at 350z-t*ch is says
"Four options are available, on the 2006 350Z Coupe and Roadster: a DVD-based navigation system (Touring, Grand Touring and Coupe Track models only); satellite radio (with choice of XM® or Sirius™ service), side and curtain side-impact supplemental air bags (Coupe) and side supplemental air bags (Roadster Enthusiast model)."