What's going on behind your flat-back diff cover?

Gale Banks is on a quest to determine if aftermarket differential covers actually do anything. In the latest video on the topic, he takes a look behind an aftermarket flat-back aluminum diff cover to see what's really happening at highway speeds. Buy Banks new patented Ram-Air Diff Covers here: https://www.bankspower.com/diffcovers Watch the full "Behind the Diff Cover" video series here:    / playlistlist=plwtmrqcwzltqr9riog8miziejux4...