Do rear diff covers really work or are they just bling? Gale Banks aims to find out. And here's how he's going to do it.

Buy Banks new patented Ram-Air Diff Covers here:
https://www.bankspower.com/diffcovers

Watch the full "Behind the Diff Cover" video
   / playlistlist=plwtmrqcwzltqr9riog8miziej-ux...