These will fit the old & new style injector for your 2004.5-2007 5.9L truck. It matches nozzles number 1659 & 5500. 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
-Must be used with Dual Cp3 pumps, 85% over Dragon Fire CP3, or our 120% over pump
-Extrude Honed Balanced matched for best results
-Great performance for OVER 750hp
