Originally Posted by Gumby
haha what no one wants an inconel header?
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How much then?
They'd all likely be built to order because everyone is going to want something different. Alternatively I've given some thought on what it would take to make the header capable of accepting adapter plates so the end user could make the choice of what turbos will meet their needs and still fit.
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The issue is that not only does the flange potentially change, but the turbo gets bigger. So it will enlarge in almost every direction, which might prove to be a BIG problem for clearance in already tight confines. I think you need to establish a turbo size
you will use, and build that header. Others will have to follow your lead, or build their own header! Too much variation otherwise.
How much power are you honestly looking to make? Remembering a stock 1.9 Opel makes 45-55 wheel HP, is 200 whp a target...or more? The Garrett GT2554 turbo I bought for my Opel wagon can support up to 240 hp, and that's about as small as they come in a ball-bearing T25-style turbo (T25 is the family of turbos, it's defined by the small flange dimensions).
I'm (really!) not trying to complicate things, just bringing some potential issues to light before they confuse matters more and skew the whole project.
Bob