Directly replace your Explorer ST’s restrictive charge pipes with aFe POWER’s BladeRunner free-flowing, heat-resistant aluminum charge pipes. TIG-Welded 2-1/4″ Hot Side and 2-3/4″ Cold Side Aluminum Pipes Features Premium Stainless-Steel SmartSeal Clamps And 5-Ply Silicone Couplings Built in CNC Machined Aluminum Blow Off Valve Adapter 1/8″ NPT Ports are Provided for Connecting Sensors or Water Methanol Injection Powder Coated Wrinkle Black for Heat and Corrosion Resistance   Flow and Performance: Smooth transitions in the mandrel-bent aluminum pipes decrease turbulence and minimize pressure loss, increasing horsepower and torque. This charge pipe kit provides a smooth transition between the turbo and the engine for lower operating temperatures and increased power. Premium Hardware: This kit includes high-quality, stainless-steel, SmartSeal clamps and heavy-duty, 5-ply, polyester reinforced silicone couplings for superior strength and durability. Custom Appearance: Finished in wrinkle black powder coating with a unique laser-etched aFe POWER logo for a custom look. When it comes to engineering for power, performance, protection and value, aFe POWER is the only choice. Emissions DisclaimerThis product is not currently CARB exempt and is not available for purchase in California or for use on any vehicle registered with the California Department of Motor Vehicles. Fitment NoteThis charge pipe kit ONLY fits vehicles, with a build date before 09/21, that are equipped with a factory bypass control valve located on the hot side charge pipe. See P/N 46-20674 for combo kit or P/N 46-20678 for hot side kit if your vehicle is not equipped with the factory bypass control valve on the hot side charge pipe.