No, the CoolStream Duo does NOT work in the 2008 Infiniti FX.
The CoolStream Duo will not work with the iPod cable in any Infiniti model built-in or after 2008. For more information about car compatibility, please check out Car Compatibility – Testing Results
For Infiniti models built in 2008 and later,Continue reading: Does the CoolStream Duo work in the 2008 Infiniti FX with factory installed 30 pin iPod cable?