> What do you mean by the header?
I mean the point where the exaust system first bolts on to the manifold.
> It is normal to have a 10 -15 mm outlet at
> the end of the pipe.. while at the beginning / manifold / cylinder port it
> is 20-28mm diam.. is usual.
Exactly. The exhaust manifold has a diamater of about 25 mm. But the pipe that
bolts on is about 10mm -- where it meets the manifold. So you see what I mean
when I say the header is small.
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