I use a Ram Mount on my cross bar inside, and tape a ext mike below the license plate, between the exhaust tips. I also use a polarized filter on the lens. It helps with the white-out, and going into and coming out of the shadows. Have the camera set at 1048x48 wide.
Got a trackday tomorrow. I'll post pictures of my set-up when I come home.
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Official GO PRO HD 370Z Owners Thread:Mounting Tips, tricks, Pictures, Videos Inside