AWE Tuning Audi RS3 / TT RS 4.5in S-FLO Carbon Inlet Tube4. 5 of pure carbon power. Presenting the S FLO Carbon Inlet Tube: for the Audi 8V RS3 and Mk3 TT RS: 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