Product Description
BorgWarner 177275 S300SX3 Turbocharger — S366/74, 0.91 A/R, T4 Housing
BORGWARNER 177275 (S300SX3 S366) combines a 66.1mm extended-tip compressor with a twin-scroll T4 0.91 A/R turbine housing for responsive street/track performance. Journal-bearing durability with adjustable housing orientation makes this a go-to for high-power single or compound setups.
Key Specifications
- Compressor (S366): 66.11mm inducer / 91.44mm exducer, extended-tip design
- Turbine: 80mm inducer / 73mm exducer, 0.91 A/R twin-scroll T4 inlet
- Exhaust outlet: 4.21" Marmon V-band
- Center section: twin hydrodynamic journal bearings; adjustable compressor & turbine housings
- Power range: ~320–800 HP (application dependent)
Universal performance turbo — verify manifold flange (T4), downpipe outlet, oil feed/return (-4AN feed / -10 to -12AN drain typical) and charge piping prior to purchase.
What’s Included
- BorgWarner 177275 S300SX3 turbocharger (S366/74, 0.91 A/R T4 twin-scroll)
Recommended Add-Ons
- CPP -12AN Oil Drain Kit (S300/S400)
- Fleece FPE-34856 S300/S400 Turbo Stud Kit
- CPP S300 3.0" Compressor Discharge Elbow
Popular Build Paths
Single T4 Upgrade: Great balance of spool and top-end for well-fueled 5.9/6.7L Cummins and comparable builds; requires a T4 manifold and matching downpipe.
S300/S400 Compounds: Use 177275 as the high-pressure charger with an S400 atmospheric for fast response and big airflow.
Shop Turbo Sections by Vehicle
Dodge/Ram Cummins
- CUMMINS MAIN HUB (Home tab)
- 1989–1993 5.9L (VE) — Turbocharger
- 1998.5–2002 5.9L (VP44) — Turbocharger
- 2003–2007 5.9L CR — Turbo/Supercharger
- 2007.5–2012 6.7L — Turbocharger
- 2013–2018 6.7L — Turbocharger
- 2019–2024 6.7L — Turbos & Accessories
Ford Powerstroke
GM Duramax
FAQ
Is the 177275 a direct bolt-on?
No. It’s a universal performance turbo with a T4 twin-scroll 0.91 A/R inlet and 4.21" V-band outlet; most OEM setups need a T4 manifold, downpipe, and supporting plumbing.
What are the inlet/outlet sizes?
Compressor cover typically uses a large 4.0" air inlet and ~3.0" charge outlet; turbine outlet is 4.21" V-band (Marmon). Verify against your specific cover option.
What power can it support?
Roughly 320–800 HP depending on engine setup, fuel, and tuning. It’s a common high-pressure turbo in S300/S400 compound builds.
Do I need an oil feed restrictor?
Journal-bearing S300s generally do not use a restrictor. Use a clean -4AN feed and a free-draining -10AN to -12AN return. Monitor oil pressure and follow best practices.
Why Buy BorgWarner Turbos from CPP Diesel
- Vehicle-specific guidance for Cummins, Powerstroke & Duramax
- Fast shipping & careful packaging
- From stock replacements to custom compound systems
- Phone & chat support from diesel pros
