Answer
Oct 24, 2025 - 02:53 PM
The Sinister Diesel Blue Spring Kit with Billet Spring Housing is specifically engineered for 2003-2007 Ford Powerstroke 6.0L engines. This kit upgrades the factory fuel pressure regulator with a stronger blue spring and billet housing, increasing and stabilizing fuel pressure. This helps extend injector life, improve throttle response, and enhance overall engine reliability—making it a top choice among Powerstroke owners. Ford issued a service bulletin recommending this upgrade for all 6.0L Powerstrokes, as the factory spring is prone to weakening over time, which can lead to reduced fuel pressure, loss of performance, and even injector failure. This kit is a must-have preventative upgrade.
