AWE 4.5" S-FLO Open Carbon Intake System for Audi RS 3 / TT RS2660 15048 S FLO Open Carbon Intake System: Combine the S FLO Carbon Inlet Tube with the Shortie Carbon Intake, and you have the impressive (and very vocal) S FLO Open Carbon Intake System. A full 4. 5 diameter configuration from S FLO Filter to turbo inlet coupler, this version delivers an increase of 7 hp and 3 ft lbs of torque at the wheels with an ample dose of turbo induction and diverter valve sounds with each rip of boost.