Smooth transitions in the mandrel-bent aluminum tubing decrease turbulence and minimize pressure loss, increasing horsepower and torque. This tube kit includes high-quality, stainless-steel, clamps and heavy-duty, 5-ply, polyester reinforced silicone couplings for superior strength and durability. 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.