1994-2002 Cummins Compound Phatshaft S478 Add-A-Turbo Kit (229409)

Industrial Injection's 2nd Gen Cummins compound PhatShaft add-a-turbo kit (S478 variant) for 1994-2002 Dodge Ram 2500/3500 5.9L Cummins (12V and 24V). An add-a-turbo kit that compounds a BorgWarner S478 atop your existing PhatShaft setup — the right setup for race trucks that have outgrown the S475-frame and need more low-side airflow to keep EGTs in check at the next power level.

The compound layout drops EGTs while supporting up to 850 HP for serious race builds. Kit ships as a complete bolt-on (your existing PhatShaft (3622306501) or similar single is required as the high-pressure stage). Multiple S478 variants are available depending on which PhatShaft you're running.

• Up to 850 HP — Compound Configuration with S478
• Lower EGTs Under Race Load
• Complete Kit — Ready to Install
• Includes BorgWarner S478 Turbocharger
• Multiple S478 Variants Available — Match to Your Existing PhatShaft
• For 1994-2002 Dodge Ram 5.9L Cummins (12V and 24V)
• Part Number: 229409

• Requires an existing PhatShaft or similar single turbo — this is an add-a-turbo kit, not a complete compound setup.
• Does not include the recommended high-flow exhaust manifold.