Audi TT TT RS Roadster 2.5-litre TFSI quattro YOC: 2009 - 2014 Part: Cat-back Info: Racing Cat-back: Resonated (quieter). No ECU tuning required‚ uses OE Tips and includes Active Exhaust Valve (works with Sport button to release extra sound when required) tailpipe design: pipe diameter: 76,2mm /3inch EC-approved: No Race system: No Valvesonic: No Part no.: SSXAU254