Hey Luis BRW,
I've been looking at pix of long tube truck headers and was thinking that with the use of some properly sized connectors you might be able to shorten the "down tube" sections and recouple them for use on applications that aren't covered by the manufacturers.
To answer your question on Tri-Y's . . . .
I believe the Tri-Y's are supposed to be great for torque but that's not really a problem on the inline sixes.
Here's a link you may find interesting if your considering building your own headers. It should also answer most of your questions about Header design. It's a VERY informative site.
www.headersbyed.com 'Crockett
