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The BorgWarner S400SX turbine housing specified as 1.25 A/R with a T4 VTF flange and 87mm reference supplies a larger A/R option for S400SX turbo builds. It’s used when a 1.25 A/R exhaust geometry is desired for tuning flow and spool. Installers should confirm manifold flange compatibility and overall system match before selecting this housing for a cartridge or turbo assembly.
BorgWarner Turbine Housing S400SX SX 1.25 A/R-T4 VTF (87mm)
