Mine doesn't leak and as far as I can tell it's the original and pretty warped, I even left the return pipe on the turbo when reassembling several times. The pipe inserts into the block so it shouldn't leak back too much anyway.
I've been looking at the yoshifab insert weighing up whether to make one myself on my lathe or to buy it. It doesn't look too hard to make but it'd be fairly time consuming to get the dimensions correct so it's a good fit. It'd certainly make any jobs involving the turbo a lot easier.
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940 B230FT
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