i came across this in my four wheeler magazine any one using or have any knowledge about this?? i know at least for my dads 7.3L power stroke it would help aLot right now he dose 1800-2000 going 65-75Mph

heres the link to the site

http://www.gearvendors.com/index.html

 

I've heard alot about them on dieselstop.com and they are suppose to be great for towing and hauling.