Key features

• •IMPROVED PERFORMANCE: The Ford Powerstroke 6.0L 2003-2007 models can't live up to their full potential thanks to the low-quality factory parts that keep holding them back. Sinister Diesel 6.0 Blue Spring Kit Upgrade helps you increase the full pressure safely and effectively up to 15% to give your ride a boost in performance you never thought possible.
• •THE PERFECT FIT: Sinister Diesel Blue Spring Kit with Billet Spring Housing made specifically for 2003 – 2007 Ford Powerstroke 6.0L Diesel Models to provide a safe, fast, and reliable install to boost performance and improve fuel economy. It comes with everything you need to install it including O-rings and hard parts to rebuild the fuel-pressure housing
• •American-Made Quality & Service – Sinister Diesel proudly designs and fabricates premium diesel performance parts in the USA, backed by exceptional customer support and a reliable 1-Year Warranty for your peace of mind.
• •Trusted by Diesel Enthusiasts – Engineered, Manufactured and rigorously tested by Sinister Diesel for proven reliability.
• •Restore Optimal Fuel Pressure – Quickly restore proper fuel pressure to factory-recommended levels, ensuring your 6.0 Powerstroke achieves peak performance, smoother throttle response, and improved engine reliability.
• •Simple DIY Installation – Designed for effortless at-home installation, this kit includes all essential hardware and straightforward, step-by-step instructions, enabling quick setup without specialized tools or professional help.