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The Sinister Diesel Blue Spring Kit with adjustable billet spring housing for 2003–2007 Ford Powerstroke 6.0L restores and lets you fine-tune regulator spring pressure. The updated kit includes the new Blue Spring, billet T6-6061 aluminum housing, gasket and O-ring set, and installation hardware; it restores lost fuel pressure, is adjustable for larger injectors, and is not compatible with E-series housings.
Sinister Diesel 03-07 Ford Powerstroke 6.0L Blue Spring Kit with Adjustable Billet Spring Housing
