Quote:
Originally Posted by GOLDCYLON
Sounds like to me that in order to achieve acceptable viewing all the time the strip is required. Yes?? 
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I can only speak from BMW experience, but to answer your question, no.
I have seen HUD on E60 5 series without the special windshield, and it was just a tad darker. The wrong windshield was put in, and that is how I was able to see the before and after. BMW uses a film in the entire windshield even though just a section is used for the HUD.
So, take that for what you will.