Product Description
S&S Diesel Motorsport 305-300SAC-SET is a brand-new, flow-matched 300% over SAC-nozzle injector set engineered specifically for the EARLY 5.9L Cummins common-rail (2003–2004). Built to OE standards and matched as a set for consistent delivery, these are the choice for serious competition builds where maximum fuel and clean rate-shape control matter.
Fitment note: This “305” series injector is for the early 5.9 (2003–2004). 2004.5–2005 “late” 5.9 applications use different injectors—do not mix. See “Fitment” and FAQ below for details.
Key Benefits
- Brand-new S&S bodies with EDM/honed SAC nozzles, sized 300% over
- Set flow-matched to tight variance for balanced cylinders
- Optimized injection rate-shape for high-output builds
- Backed by S&S quality and industry-leading processes
Fitment
- Engine: Cummins 5.9L 24-valve common-rail (EARLY “305 hp”)
- Model Years: 2003–2004 (all Dodge Ram 2500/3500 with early 5.9 CR)
- Part Number: 305-300SAC-SET (NEW, set of 6)
What’s Included
- (6) Brand-new S&S injectors – 300% over SAC nozzles
- Set flow-matched to S&S standards
- Install-ready units (cores not required on NEW bodies)
Recommended Supporting Parts
To feed and control 300% injectors properly—and protect your engine—pair with these CPP Diesel parts and categories:
- High-output CP3 pump(s) or dual-fueler upgrades
- Lift pump (AirDog/FASS) with proper filtration and supply
- Injector install kit & seals
- New injector feed tubes/lines
- ARP head studs for high boost/cylinder pressure builds
- Custom tuning calibrated for 300% over fuel
- Rail pressure relief/monitoring for control and safety
Installation & Notes
- Professional installation and custom tuning strongly recommended
- Use clean fuel, prime the system, and follow torque/cleanliness best practices
- Intended for competition/off-road builds where legal and appropriate
FAQ
Will these fit my 2005 5.9L Cummins?No. 2004.5–2005 trucks are the “late” 5.9 configuration and use different injectors. This 305-series part number is for early 5.9 (2003–2004) only.
Do I need a bigger CP3 and a lift pump?Yes. 300% over injectors demand significantly more supply and high-pressure fuel. We recommend an upgraded CP3 (or dual fuelers) plus a quality lift pump and filtration.
Are these new or reman?This listing is for NEW injectors. S&S also offers reman options under “-R-SET” part numbers.
What tuning changes are required?Custom tuning is required to manage idle quality, smoke control, timing, and pulse width for 300% nozzles.
Do I need new feed tubes?Strongly recommended to avoid sealing issues and to protect new injector tips. See our feed tubes/lines category linked above.
