Blue Silicone Air Intake Hose Kit (MMHOSE-370Z-09AIBL) by Mishimoto. Includes: 2 Silicone Air Intake Hoses, 4 3in T-Bolt Clamps, Installation Instructions. Inner Diameter: 2.70in. Outer Diameter: 3.0in. The silicone air intake hoses are made with a combination of high grade silicone and heat-resistant embedded fibers to prevent increased temperatures in the intake charge caused by excess radiant heat in the engine bay. Preventing increased intake charge temperatures will ultimately increase horsepower and provide improved performance. The air intake hose is the perfect replacement for the OEM intake piping.