Quote "Robert, they ain't stacks unless they are at least 5" :-laf Thats funny! But I thought at the time 5" would be a little much for a 250, and going back, I would do the same thing as the 4" suit the truck. For the crew it will definetally be 5".
Robert
Edit. I took flex to the under side of the bed, and connected it to the Y pipe (the top being in the bed) and ran pipe to either side and up. If the truck was longer (club, crew) I would definetally put the plumbing under the bed.