A little disappointed
I installed Brute Force HD Diesel on a 2005 F-350 King Ranch and haven't really notice much difference. I'm sure there is more HP and torque, but I drive pretty conservatively so I don't notice it much. Also no difference in MPG. The HD version barely fits in the space, and as near as I can tell the only advantage is that you have to clean it less often. So unless you drive in a really dusty/dirty environment I would recommend going with just the Brute Force. It is about $90 cheaper and will fit in the space alot easier, so taking if off to clean should be a lot easier than the HD model.