1) Get a custom manifold with a turbine inlet flange that suffices your current turbo.
2) Get a normal B-series turbo manifold then an adapter flange to mate with your current turbo.
If you have any questions about flanges or adapter plates, PM me and I can direct you on where to get it......
I persoannly think that a T25 or TD05 are too small for any B-series. Good enough for the streets tho... I guess. Just remember that you'll get used to it quick. My T3T04e 57 trim .63 A/R got old quick..... and that's a decent size turbo.
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