Use Our Coupon Code, Get The Lowest Price Anywhere On This Product! Jammer injector nozzle for Cummins engines. These "Jammer" nozzles have been designed for the 1998.5-2002 5.9L Cummins ISB engines in Dodge Ram trucks and RV coaches. The proprietary process used to vent these injector nozzles intricately machines 8 orifices into the tips. Compared to the stock 7-orifice injectors. Jammers feature better atomization, faster fuel flow and enhanced spray angle. The increased number of orifices enables the injectors to deliver more fuel while still maintaining proper fuel pressure. Improved combustion-chamber cleanliness. Improve fuel economy by up to 1.5 mpg depending on individual driving style. Jammers offer incredible value to the consumer with the same performance as a full set of injectors, since the use of the Truck's existing injector bodies are reused. Installation is recommended by a certified fuel shop, a pop off checker is required.