TEGIWA 70mm Silicone Intake Hose. Silicone hoses can operate under higher temperatures and pressures than OEM rubber hoses and are far less likely to perish. So if your K-Series block is running increased power, this replacement silicone intake hose comes highly recommended. They brighten up your engine bay too! These hoses have a 70mm internal diameter to accommodate 70mm throttle bodies, a popular upgrade for the K-Series engine. Available in black, red and blue.