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Apr 28, 2026 - 11:53 AM
The Sinister Diesel Blue Spring Kit 6.0 includes a billet spring housing, a new "Blue Spring," a gasket/O-ring set, and all required hardware. This comprehensive 6.0 blue spring kit ensures an easy, hassle-free installation and provides everything needed for your 2003-2007 Ford Powerstroke 6.0L upgrade.
