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These will fit the old & new style injector for your 2004.5-07 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 our Dueling Dragons (2-120% over CP3's)
-EDM AND Extrude Honed Balanced matched for best results
-Great performance for 1200HP and UP
