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Now in using the Borg Warner EFR 6758 we use a T25 0.64 sized turbine housing. The T designation of a turbos description (T3,T4, T25 etc) will generally be referring to its flange dimension. Most exhaust manifolds for our TD42 will come with a T3 flange. This means we need to adapt to the smaller T25 of the Borg Warner. I have also had these parts ceramic coated.