Product Description

BorgWarner 177284 S300SX3 Turbocharger — S366/74, .91 A/R, T4 Housing

BORGWARNER 177284 combines a 66mm S366 compressor, 74mm turbine, and a .91 A/R T4 twin-scroll housing with a 90° compressor outlet. Built on the AirWerks S300 platform with proven journal bearings, it’s a go-to for responsive street/strip singles and S300/S400 compound atmospheres.

Key Specifications

• Compressor (S366): 66mm inducer, 3.60" exducer, 90° outlet
• Turbine: 74mm wheel, .91 A/R twin-scroll T4 inlet
• Center Section: journal bearings; adjustable compressor/turbine housing orientation
• Use Case: 320–800 HP builds; excellent base for compounds

Universal turbo; verify manifold flange, downpipe style, oil feed/return, and charge piping before purchase.

What’s Included

• BorgWarner 177284 S300SX3 turbocharger (S366/74, .91 A/R T4)

Recommended Add-Ons

• CPP -12AN Oil Drain Kit (S300/S400)
• Fleece FPE-34856 S300/S400 Turbo Stud Kit
• CPP S400 4.0" Compressor Discharge Elbow

Popular Build Paths

Responsive Single: Pairs well with supporting fuel/air mods; expect quicker spool than many S400s while keeping strong top-end.

Compounds: Run 177284 as the high-pressure or atmospheric unit depending on goals; we’ll spec the mate turbo, gates, and piping for you.

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• Duramax — Turbochargers
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FAQ

Is the 177284 a direct bolt-on?

No. It’s a universal turbo with a T4 twin-scroll inlet and .91 A/R housing. Most OEM manifolds are T3; plan a matching manifold, downpipe, oil lines, and charge piping.

Street manners vs. S400?

The S300SX3 66mm typically spools quicker than many S400 single setups while still supporting strong top-end with proper fueling.

What’s the compressor outlet?

90-degree outlet (verify your charge pipe orientation or plan an adapter/elbow).

Do I need an oil restrictor?

Generally not for journal-bearing S300s; ensure clean feed, proper pressure, and a free-draining return (-10AN to -12AN recommended).

Why Buy BorgWarner Turbos from CPP Diesel

• Platform-specific guidance for Cummins, Powerstroke & Duramax
• Fast shipping & careful packaging
• From stock replacements to custom compound systems
• Real humans on phone & chat who build these trucks