Wait a minute here. I'm confused now... I just went to double check something. Who knows anything about firing order? If it is 1-3 4-2 doesnt that mean that the pipes should be arranged like the second picture? (first pipe with the third and second with the fourth) so that they fire together and have enough force to go down the header?
or are they supposed to be seperated like the first picture where the first and last are together so that when each fires it is all alone in their respected pair?
because I figured I would take a look at the escort GT header from focusslavage.com and take a look here, this escort GT header has the the two outside pipes together so that when each fires it is alone-
now I'm not even close to a mechanic, all I know is that there is a better header out there somewhere, if someone can answer my question about firing order we can get this puzzle solved!