Speedwagen Header design tip

The diagram above represents the arangement of the exhaust ports in a Subaru head. As you can see the runner length of one cylinder,compaired to the adajacent cylinder is "longer". If you are designining a set of equal length tuned header, you nee to keep this difference in mind. What you want to be the same length is the distance from the exhaust valve seat to the end of the tube---not the tubes being the same length. This is a little tid-bit gleaned from Cobb tuning

http://www.cobbtuning.com/info/?id=3046

This link above is a good elementry article on Header Design--check it out

(regarding the X-File document--Von Chop has contacts, and the Speedwgaen has been reclocated to area 51-A for some off world assistance---sssshhhh! don't tell)