These will fit the newer style injector for your 2003-04 5.9L truck. It matches nozzles number 5499. This is a complete kit that includes the nozzle install tool, 6 nozzles, and 6 copper o-rings.

-Maximizes your fuel more efficiently, better atomization

-Great for the daily driver looking to increase mileage and bottom end & top end performance for towing.

-Must be used with our Dragon Fire Extreme CP3 85% over

-Extrude Honed Balanced matched for best results