Rear Window Ventilation / Air Flow Test

[BigOleOgre]

What does one of these do then i wonder?

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[NM Mike]

Would be interesting to see what it looks like in a wind tunnel with one of those installed.

 

[bigb]

I swear when I put a cab height topper on my diesel Super Duty my MPH went up.

 

[bigb]

I have a topper and when weather permits that rear window is the best thing since sliced bread. I can even leave it open when I park since nobody can get to it.

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