I'm under the impression that Tri-Y headers help the midrange on a V8. Would they do the same on an inline 6? I'm looking for off idle to maybe 4500RPM...
I would be building my own, probably using a Jeep 4.0 tubular exhaust manifold, and some other collected parts to create this.
Get a copy of Phillip H Smith's book, The Scientific Design of Exhaust and Intake Systems. If you get it and read it, you better have your thinking cap on snug but not too tight. It gets a bit deep in places.
