Neither, do some more research on what actually works these days and go from there.
Or just fit a 6466 with a twin entry rear and manifold and waste gate to suit and twin fuel pumps and 1650 injectors and a clutch and a bunch of other stuff I haven’t listed
I'm not certain of your capabilities but parts and labour of a 2.8 will be well above 15k. You could do things slowly though (I.E Buy parts, save up, build block, save up, build head, etc.)
As mentioned, go single turbo.
Will ask the exhaust shop about this and get a quote if possible. My current pipe is with flanges and not welded on, so I can easily switch to my old cat if I wanted. I'd do it that way too.
This shouldn't be an issue as long as there are no exhaust leaks afaik. Stock one was with flanges as well.
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