Windshield/Radar Detector Issues
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The stock glass with the darkened border (radar detectors see through this OK).
A version with a metallic component to reflect light and keep heat down in the car (radar detectors virtually useless with this -- need an external mount and you sacrifice your "all around" view for detectors such as the V1).
I don't know what is referred to by "dual pane laminated acoustic" - all modern auto glass is a multi-layer laminate with plastic (i.e. "safety glass"). I don't think Audi offered something like MB has - they have a version with an air gap for better sound control and anti-fogging.
Nothing to do with the solar-powered vent that exhausts air via the sunroof if it is parked on a hot day. This may be bundled with a package that includes the "radar proof" windshield, though. I don't see this option currently in the US.
There was other windscreens with the same effect, but not double layer. One had a kind of metallic, silvery looking outside. Never seen this on the 4,2, only on the V6's.


