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My friend installed a navigation in his vehicle. He had to mod a bunch of things such as shaving the teeth on the navigation but there ended up with a two inch gap. I am not sure if its worth changing it because of this or keeping it with the stock navigation
Just some more info to help the OP with his sale:
If this unit is for 06-08 models, then there will be a gap if you install it in 09-12 model, unless you buy the 06-08 ac vents