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i want to put in a navigation stereo for my 20065 envoy but what is this RPO code that i cannot find on my suv. Y91 - Y92 i dont see these codes in my truck
 

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Which Navi unit are you looking to get?
INR- joystick or
TNR- touchscreen?

I'm pretty sure 2005 is NoN Lux even with the Bose system.
 
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