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Thanks, Oz.
For the moment, it looks like it'll be spring-fit stubs, at least for the first build and probably the final one too.
If I do go for welded stubs, they'll possibly be made from stubs cut from std monster headers, then sleeved (ie telescoped) up to full dia using a short, bridging tube of interim dimensions.
This will require two welds, but the end one will still be around 20mm from the flange, so hopefully far enough away.
And with luck, although I don't know exactly what material the tubing is, it should hopefully be all the same .. and weldable using normal exhaust-welding kit.
The ebay offcut is actually described as F51 grade, which is apparently a "duplex, 50/50 ferritic/austenitic grade.
Bit of a new one on me, that.
I'm not expecting to have to weld it though, as I plan to use it for the spring-fit stubs.
But I may change my mind. Do you know if this stuff is easily weldable ?
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