Product Description
Fix the CP4 weak link and restore rock-solid fueling on your 2019–2020 Ram 2500/3500 6.7L Cummins with the INDUSTRIAL INJECTION 23S401 CP4-to-CP3 Conversion Kit. This direct-fit package is emissions-compliant, no-tune required, and includes an upgraded 10mm stroker CP3 for higher rail pressure capability with factory drivability.
Fitment
- 2019–2020 Ram 2500/3500 6.7L Cummins (pickup models originally equipped with Bosch CP4.2)
- Not intended for Cab & Chassis applications
What’s Included
- Industrial Injection 10mm stroker CP3 pump (replaces CP4.2)
- Model-specific brackets, lines/fittings, harnesses/adapters, and installation hardware
- Detailed install information (no tuning required)
Why Convert?
- No-tune, emissions-compliant operation with factory calibrations and emissions equipment
- Proven CP3 reliability vs. known CP4 failure modes that can contaminate the fuel system
- 10mm stroker shaft design to sustain commanded rail pressure at higher load/RPM
Recommended Parts (CPP Internal Links)
- CP3 Pumps & CP4-to-CP3 Conversion — 2019–2024 Cummins
- S&S RAM-CP3-KIT (No Pump) — Alternate hardware option
- Fuel System — 2019–2024 Cummins (filters, lines, accessories)
- S&S 6.7C19-10SAC-HO-SET Injectors — 2019–2024 HO
- S&S 6.7C19-50SAC-SET Injectors — 2019–2024 (Performance)
Helpful Notes
- Designed for otherwise stock-tuned trucks; follow the included instructions for a clean install.
- After any CP4 failure, flush/replace contaminated components (tank, lines, rails, injectors) before installing the CP3.
FAQ
Is tuning required after the conversion?No. This kit is engineered to work with the OEM calibration and factory emissions equipment—no custom tuning is needed.
Why replace the CP4 with a CP3?The CP3 is widely regarded as more durable and tolerant of real-world fuel conditions. It helps prevent the catastrophic debris-through-the-system failures associated with the CP4.
Will this kit increase power?It primarily improves reliability. The included 10mm stroker CP3 can better sustain commanded rail pressure, supporting mild performance upgrades while retaining stock-like drivability.
Does it keep all emissions equipment?Yes—this conversion is designed to operate with all factory emissions components in place.
