MagnaFlow Sport Series SS Cat-Back Exhaust | Audi A4 Quattro (09-16) (15519)The MagnaFlow 2009 2016 Audi A4 Quattro Sport Series Cat Back Performance Exhaust System enhances your 2. 0L 2009 2016 Audi A4 Quattro with an aggressive character that is sure to help you stand out from the other Audi A4 Quattro you encounter on the street. With its 3in. diameter fast flowing mandrel bent main piping that passes through 2 Straight Through mufflers before ending in a Dual Straight Driver Side Rear exit with 3. 5in. Polished Welded On