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Brett & Listers:
Brett what you are trying to do here is a GREAT thing. My
earlier post regarding the inherent difficulties w/ a performance header
was in no way taking a shot at Mike--sounds like a good guy.
With that said, and without swimming too far out in the ocean of
theory & technicalities, here you go:
The "cost" of a header has little or nothing to do with (a) the
actual labor it takes to make A header, or (b) the SS used in the
header. Obviously, the German piece referred to has profit built in.
HOWEVER, there is an enormous cost [or there should be] in R&D for an
honest to God high-quality SS header that helps, not hurts, performance
on a turbo motor. If you don't believe me, call ANY honorable race shop
that builds one-off SS header[s] and tell them what you want. Most will
be happy to work w/ you. After they get done w/ you, $800 will seem like
chump change. There is just SOOOOO much that goes into the proper design
of a header. From experience I can tell you that extensive testing [R&D]
goes into not only what most think of as the "header", but the collector
is a beast all its own. That is, where the "header" dumps all pipes 
into one . You have not only backpressure to contend with, but an
improper design will actually cause the exhaust to revert back on itself,
making temperatures and all the other monsters raise their ugly head.
Anti-reversion work is STILL a constant process at houses that do this
work all the time [Hedmann, Thorley, Hooker, etc.] One-offing, which is
basically what you are talking about for the I5t, is very seldom [read
never] done cheaply.
I don't mean to dissuade anyone here, but experience has taught
me to listen to the ice cracking beneath me.
BTW, Hope this Works for you!!!!!!