aFe BladeRunner 2-1/2 IN Aluminum Hot Charge Pipe Black 22-23 Subaru WRX H4-2.4L (t)Smooth transitions in the mandrel bent aluminum pipe decreases turbulence and minimizes pressure loss, increasing horsepower and torque. This kit includes high quality, stainless steel, SmartSeal clamps and a heavy duty, 5 ply, polyester reinforced silicone coupling. This charge pipe kit also features a factory style billet aluminum quick connect Adapter with an o ring seal to ensure a leak free fit while maintaining superior strength and durability.