The Sinister Diesel Regulated Fuel Return Kit is designed to fit the 2003 - 2007 model year Ford F - 250 and F - 350 Super Duty equipped with the 6.0L Powerstroke Diesel Engine. It's constructed with CNC machined billet aluminum parts and stainless steel braided fuel lines and nickel - plated fittings.This Powerstroke Fuel Return Kit comes with an adjustable fuel regulator and fuel pressure gauge to help you adjust and monitor constant fuel pressure to prolong the life of your injectors while getting the power levels you need. The Sinister Diesel Regulated Fuel Return Kit for the 6.0L Powerstroke is a complete package with everything you need and doesn't require any additional parts. Note Not legal for sale in the state of California, Note A 38in quick disconnect tool is required for installation, Note To ensure longevity of your Fuel Return Kit, it is HIGHLY suggested to also install a Lift Pump or Fuel Air Separator with additional filtration. FeaturesHigher Filtration Efficiency, CNC Billet Aluminum Construction, Blue Anodized FinishIncludesSinister Diesel Fuel Filter Block, Adjustable Fuel Regulator, Oil Filled Fuel Pressure Gauge, All New High Flow Fuel Lines, Retaining Clips, Protective Cover For Braided Lines.