S&S DIESEL RAM-CP3-12HS 12MM CP4-TO-CP3 CONVERSION KIT — 2019–2020 RAM 2500/3500 6.7L CUMMINS

S&S Diesel RAM-CP3-12HS 12mm CP4-to-CP3 Conversion Kit — 2019–2020 Ram 2500/3500 6.7L Cummins

Stop worrying about CP4 failures. The S&S Diesel Motorsport RAM-CP3-12HS replaces the factory CP4.2 with a brand-new Bosch CP3NH-based 12mm High-Speed CP3 and OE-grade hardware for a clean, durable install. S&S pre-installs the proprietary drive gear and pilot on the CP3, and the pump is overdriven ~1.5× engine RPM for high-speed fueling performance.

• Brand-new CP3NH-based 12mm High-Speed CP3 (not reman) with S&S internal mods.
• Proprietary drive gear & pilot pre-installed for drop-in fit.
• OE-quality injection-molded ECU mount, OE-style quick-connects & braided supply line.
• Includes autofrettaged high-pressure fuel line and CP3 data sheet.

Fitment

2019–2020 Ram 2500/3500 with 6.7L Cummins (SO & HO). Competition-oriented 12mm HS pump — tuning is required.

What’s Included

• S&S 12mm HS CP3 pump (RAM-CP3-12HS)
• Proprietary drive gear & pilot (pre-installed)
• OE-grade ECU mount
• OE-style quick-connect fittings & braided supply line
• Autofrettaged high-pressure line
• Documentation / CP3 data sheet

Note: For a no-tune street solution, S&S offers a different variant (RAM-CP3-NOTUNE). This page is specifically for the 12mm HS kit.

Recommended Supporting Parts

• 2019–2024 Cummins CP3 Conversion & Pumps
• 2019–2024 Cummins Fuel System Upgrades
• Fleece Under-Bed Fuel Filter Assembly (19–24)
• Shop All S&S Diesel at CPP

Installation & Notes

• Professional installation and calibration recommended for the 12mm HS pump.
• Emissions compliance varies by configuration; verify local regulations before use.

FAQ

Yes—12mm HS kits require tuning to take full advantage of fueling and maintain proper control.

The CP3NH-based pump is known for durability, and S&S pairs it with OE-grade components for an OE-like install.

Yes, it’s listed for 2019–2020 Ram 2500/3500 6.7L Cummins, including HO applications.