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S400 - S475 Race Compressor Housing Cover fits Borg Warner S400 Turbo
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S400 Single Turbos
S400 Single Turbo Systems for Cummins
Maximum Airflow for Serious Performance Builds
S400 single turbos are designed for high-horsepower Cummins builds targeting 600-800+ HP. Popular in competition, drag racing, sled pulling, and dedicated performance trucks, S400 turbos deliver the massive airflow needed for extreme power levels—at the cost of some low-end response.
Massive Airflow
Supports 600-1000+ HP with proper fueling
Competition Proven
Trusted in drag racing, sled pulling, dyno competitions
Multiple Frame Sizes
S472, S475, S480, S483—matched to your power goals
Complete Systems
Includes manifold, hardware, built for high-power duty cycle
⚠️ Important: S400 singles are NOT ideal for daily driving or general towing. They have noticeable lag below 2,000 RPM. For street/tow use at moderate power levels (400-550 HP), see our S300 Single Turbos. For heavy towing at higher power, see Compound Turbo Systems.
Planning a full system? See our Add-A-Turbo Kits, S300 Single Turbos, and 6.7 Cummins Exhaust Manifolds.
S400 Single Turbo Systems - FAQs
The numbers indicate compressor wheel inducer size (millimeters) and frame capacity:
- S472 (72mm): Smallest S400, best low-end spool for the class. Good for 600-700 HP builds wanting some street manners. Still laggy below 1,800 RPM.
- S475 (75mm): Most popular S400 for 650-800 HP street/strip trucks. Balanced spool vs. airflow. Common in mild competition use.
- S480 (80mm): Serious competition turbo. 750-900+ HP capability. Expect significant lag—this is for dedicated builds, not daily drivers.
- S483 (83mm): Maximum airflow for 900-1000+ HP. Sled pulling, pro drag racing, dyno competition. Professional-level builds only.
Larger turbos need more supporting mods (injectors, pumps, built transmission, aggressive tuning) to make power worth the lag trade-off.
Technically yes, but we don't recommend it. Here's why:
- Significant turbo lag: Below 2,000 RPM, you'll have minimal boost. City driving, stop-and-go traffic, and parking lots feel sluggish.
- Smoke: Without boost, the truck will smoke heavily until the turbo spools. Not great for daily use or emissions areas.
- Drivability: You'll constantly be downshifting or waiting for boost. Frustrating in normal driving.
Better options for street/daily use:
- 400-550 HP goals: S300 Single Turbos (S362, S366, S369)
- 600-700 HP with street manners: Compound Turbo Systems
S400 singles are best for dedicated competition trucks, weekend racers, or builds where performance matters more than daily comfort.
S400 turbos support serious horsepower with proper fueling and tuning:
- S472: 600-725 HP
- S475: 650-825 HP
- S480: 750-900+ HP
- S483: 900-1000+ HP
⚠️ Critical supporting mods required for these power levels:
- Large injectors (150-200% over stock or larger)
- Dual CP3 pumps or modded CP3 (6.7L)
- Built transmission (rated for 700+ HP)
- Aggressive custom tuning
- Upgraded fuel system (lift pump, lines, filters)
- Upgraded intercooler and cooling system
- Forged internals recommended beyond 800 HP
These are professional-level builds, not bolt-on upgrades. Budget $15k-30k+ for a complete S400-based high-HP system.
Not recommended. Here's why:
- Terrible low-RPM response: When pulling a grade from lower speeds (1,200-1,800 RPM), the turbo won't spool. You'll smoke and lose speed.
- Constant downshifting: You'll need to keep RPMs above 2,000-2,500 to maintain boost, meaning constant gear hunting.
- Frustrating experience: What should be confident towing becomes a struggle to keep the turbo lit.
For towing with high power (600-700+ HP), we strongly recommend:
- Compound Turbo Systems — Best low-end response, cooler EGTs, drive pressure control
- Large-frame S300 (S369) — Usable for moderate towing if you keep power under 600 HP
S400 singles shine in competition where you're in the high RPM range constantly. For real-world towing, they're the wrong tool.
For competition/dyno/drag racing (peak power): S400 single
- Simpler to tune for max power
- Less complexity = fewer failure points
- Lower cost ($3,500-5,000 vs. $5,500-7,500 for compounds)
- Proven in competition at 800-1000+ HP
For street/strip, heavy towing at high power, or sustained performance: Compound system
- Much better low-end response and drivability
- Cooler EGTs under sustained load
- Lower drive pressure = less engine stress
- Can tow heavy loads safely at 700+ HP
Bottom line: If you're ONLY racing and don't care about street manners, S400 singles are king. If you want high power that's also usable for towing or street driving, compounds are the better choice despite higher cost.
