Hey guys im new here, just bougt an 04 f250 crew cab 4x4 with the 6.0L and i was wondering if you guys think stacks would be a good mod? i love the looks of them and have read that they help with torque and mpg's. right now it has the Banks power big hoss kit in it and 4 inch exhaust. this is really just a prefrence question. what would you all do?!