S&S Diesel Motorsport RAM-CP3-NOTUNE – 6.7 Cummins CP4 to CP3 Conversion Kit (No Tune Required)

Protect your 2019–2020 Ram 2500/3500 6.7L Cummins from the #1 weak link in the fuel system. The factory Bosch CP4.2 high-pressure pump is known for premature failures that send metal debris through the entire high-pressure system, often destroying injectors, rails, and lines in a single catastrophic event.

The S&S Diesel Motorsport RAM-CP3-NOTUNE kit eliminates that risk by replacing the CP4 with a brand-new, S&S-calibrated Bosch CP3NH pump. The CP3 has a long-proven reputation for handling extreme pressure, RPM, and real-world conditions without the failure modes of the CP4.

Key Benefits

• Dramatically improved durability and long-term reliability
• No tuning or calibration required — retains factory rail pressure control and emissions equipment
• Factory-like drivability with no change to stock output
• 50-state legal (CARB EO #D-756-5)
• Clean, OE-style installation that looks like it came from the factory

What’s Included

• Brand-new Bosch CP3NH pump, internally modified by S&S for durability and high-speed performance
• Proprietary drive gear and pilot pre-installed
• OE-quality injection-molded ECU mount
• OE-style quick-connect fittings and braided low-pressure supply line
• Autofrettaged high-pressure fuel line
• All necessary hardware for a complete conversion

Fitment

2019–2020 Ram 2500 / 3500 with 6.7L Cummins (pickup applications). Not recommended for Cab & Chassis models due to potential increased engine noise from differences in cam gear loading.

This is the straightforward “disaster prevention” upgrade for owners who want peace of mind without modifying power or emissions systems. Install it once and stop worrying about a CP4 failure taking out your entire fuel system.