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You are mistaken or I'm not explaining it well. When I said carbon fiber insert I mean the stinger stripe on the hood, not the air duct (though I may do the air duct later). For people who have the exposed carbon fiber hood I've hear the exposed carbon in the stinger stripe area was called an "insert". From my understanding the entire hood is carbon fiber but if you just stripped the paint off the roof to expose the carbon fiber it wouldn't look nice, rather it'd look a lot like the "carbon flash". The term "insert" was used to refer to that area so I assumed that there was perhaps a thin sheet of real carbon fiber that was "inserted" on top of the hood so that you got better looking carbon fiber. I'd like that. I'm beginning to think it doesn't exist so I'm looking for Carbon Fiber Vinyl stuff now.
From what I understand, GM had corrected this misalignment issue with the visible CF hood and roof sometime in 2016. Well at least I hope so as I had just ordered them on my 2017 GS lol. But like others have mentioned, while the roof and hood is made from CF, it is not laid up using CF woven cloth in the traditional way, but rather chopped up CF, so the appearance is not what we would expect. I believe GM calls this Carbon Nano Composite. So on these "Visible" parts, GM lays up a layer of woven CF cloth on top of the CNC so it will have the appearance of the CF that we would expect. So if that is the case, I guess a good CF Film would achieve the same result.