[Piotrsko]

Not a ram fancier, I do f250's. They are similar. There is generally this huge upflow of air beyween the cab and the bed, more noticeable with the cab high shell and it causes a wind wall. I put an inflatable seal on mine for a while and noticed a 5% efficiency gain until the SoCal desert sun destroyed it. When I had the turbo uppipes start leaking Co, I discovered everything in the tunnel entered the cab through the pressure flaps in the rear floor. There is a serious pressure gradient between the cab and bed.