[s-cars] Primary size for a tube header?

[Trevor Frank]

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So I am getting fairly serious about building my equal length tube
header.



First question:

Does anyone have any data, i.e. lengths and tubing i.d. for a lehman,
mtm or audi motorsports tube header or even the SQ em?



Second Q:

What size for the primary tubes.  Anyone using stepped tube sizes.  I
can get 321 s.s.180 bend's in 1.75" x .049 wall for pretty cheap like 30
ea.  Approx 5 or so needed.  The stock exhaust ports would match up with
1.625 x .049 wall perfectly.  They are more like $58 ea for the bends.
I am wondering if loosing the velocity will be an issue.



More Q's:

Anyone have recommendation on exhaust velocity, I have talked to some
people, turbonetics and Innovative but have not gotten any answer with
much confidence.  I am wondering if anyone has bothered to fill out
burns stainless's engine exhaust analysis sheet.  To have a header tube
size and configuration for out motors anylised.









I have the material for the flanges, and have done the cad and cam for
it.  316 stainless steel approx .48 in thick.  If anyone wants one let
me know.  I will be running them sometime next month.  I will also be
running inlet flange to the turbo and outlet flange from the turbo,
k-24/k-26.  I have enough material to run approx 5 sets of exhaust
flanges and a few sets of turbo flanges.



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