Sinister Diesel’s new Blue Spring Kits are factory upgrades that solve the problem of reduced fuel pressure due to “spring fatigue” in 6.0L Powerstrokes. Sinister’s kits return fuel pressure to original factory specifications resulting in better performing, longer lasting injectors. These kits help most trucks idle more quietly and rev-up more quickly. Turbos also spool-up faster. The adjustable version of the Blue Spring kit allows you to increase pressure for big injectors or customize performance based on the way you drive.
The billet aluminum housing on these kits is thicker and stronger than the factory cast aluminum, eliminating leaking or “weeping” of fuel from the sides which is common in factory units. These kits are anodized Sinister blue to add a clean look under the hood. The kits include all the O-Rings and hard parts needed.