I would like to know the same as Jim, I ran a filter from airaid, I didn't like how it felt. There was a ******* when I mashed the pedal. I switch to a K&N and that is what I've been using now. I would like to get my hands on a BHAF to see if that helps.

I've ran the truck with no filter in the winter and there is way more pickup without it. I know there is a restriction somewhere, I looked at other trucks running the BHAF and it's five times bigger than my K&N Cone. I would think that would give you more CFM of air as the filter gets dirty. I don't want to run without a filter especially during the summer going down a dirt road.

 

4 inch, i used a short piece of 4 inch aluminized exaust for the pipe.

 

Here's my BHAF and Ol Smokey Mount.