AWE 4.5" S-FLO Carbon Inlet Tube for Audi RS 3 / TT RS2660 15044 S FLO Carbon Inlet Tube: The S FLO Carbon Inlet Tube is the largest amongst its peers, with impressive adaptability to facilitate maximum gains. The colossal 4. 5 S FLO Carbon Inlet tube bridges the gap between the turbo inlet pipe and the factory airbox seamlessly. The S FLO Carbon Inlet Tube is for drivers looking to extract the most out of their factory airbox while increasing throttle response.