Product Description

BORG WARNER 178789 S400SX TURBINE HOUSING 1.10 A/R-T4

Unlock reliable top-end flow for your S400 build with the genuine BorgWarner 178789 1.10 A/R T4 twin-volute turbine housing for 87mm wheels. Precision cast for durability and heat control, this housing is a proven choice for single and compound diesel setups where fast spool and strong horsepower are the goal.

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Fitment & Notes

• Platform: BorgWarner AirWerks S400 / S400SX family
• Turbine Wheel Size: 87mm (VTF / twin-volute)
• A/R: 1.10
• Inlet Flange: T4 divided (twin-scroll)
• Typical Use: Single or compound diesel performance builds seeking strong mid- to top-end flow
• Compatibility Tip: Verify wheel size, volute style, and flange before ordering; match to your S400 center section and downpipe geometry.

Cross-Reference / Alternatives (BorgWarner on CPP Diesel)

• BORG WARNER 178787 — S400SX 87mm, 0.90 A/R, T4
• BORG WARNER 178788 — S400SX 87mm, 1.00 A/R, T4
• BORG WARNER 178790 — S400SX 87mm, 1.25 A/R, T4
• BORGWARNER 168319 — S400 1.10 A/R, T6 (Twin-Scroll)
• BORGWARNER 171698 — S400SX4 96mm, 1.32 A/R, T6
• BORGWARNER 177104 — S400 83mm, 1.10 A/R, T4
• BORGWARNER 177105 — S400 83mm, 1.25 A/R, T4

Why Buy from CPP Diesel

• Genuine BorgWarner AirWerks components
• Diesel-focused fitment help and fast shipping
• Inventory that supports single and compound S400 builds

Frequently Asked Questions

Will this 178789 housing fit my S475? Yes—if your S475 uses the 87mm turbine and a T4 twin-volute inlet. Always confirm wheel size and volute style before ordering.
Is this housing divided (twin-scroll)? Yes. It is a T4 divided (twin-volute) S400 housing designed to support efficient pulse energy to the turbine.
Can I pair this with a larger A/R later? Absolutely. See the 1.25 A/R T4 option (178790) in the Cross-Reference list for additional top-end flow.
Does it include v-band hardware or a wastegate port? No hardware or wastegate port is included unless stated on the product page. Reuse compatible hardware or source separately.

Specifications for BORG WARNER 178789