Industrial Injection 227426 S475 .90 A/R 2nd Gen Turbo Swap Kit 5.9L Cummins

The Industrial Injection 227426 S475 2nd Generation Turbo Swap Kit is engineered for the 2003–2007 Dodge Ram 5.9L Cummins diesel and delivers serious competition-level airflow in a complete, bolt-in package. This kit directly addresses the limitations of the factory turbocharger, which is only capable of supporting power levels below 450 horsepower before becoming a bottleneck — and a liability.

The factory turbo's positioning — centered over cylinders four and five instead of three and four — causes uneven cylinder temperatures, running the front cylinders hotter than the rear. The S475 swap corrects turbo placement on the engine for improved thermal balance and airflow efficiency.

Turbo Specifications:

• Compressor Wheel: 75mm
• Turbine Wheel: 83/74mm
• Turbine Housing: .90 A/R T4
• Airflow Capacity: 100 lbs/min
• Turbine Housing Style: V-Banded Race Cover

Kit Features:

• Complete installation kit — includes all hardware needed for a clean install
• Custom S&B designed intake included
• Lower exhaust gas temperatures (EGTs)
• Track-focused performance tuned for high-output 5.9L Cummins builds
• Also known as part number IND227426

The .90 A/R turbine housing is the ideal choice for builds running smaller injectors (around 150 over), oversized tires, or numerically lower gear ratios such as 3.42 or 3.73 — the tighter housing helps build drive pressure to assist in turbo spool under these conditions. For maximum top-end power above 800 rear-wheel horsepower, this kit works best paired with custom tuning and an upgraded injector set.

Note: Injector upgrades are required to maximize spool-up and performance with this kit. This product is designed for closed-circuit competition use only and is not legal for on-road, off-road, or dual-use applications. Compliance with all applicable state and federal emissions regulations is the responsibility of the end user.