The perfect way to unleash hidden horsepower in a modern turbocharged engine is to upgrade the restrictive factory catalytic converter and resonator with a smoother, higher flowing unit. This is a great way to increase performance and add a nice growl to the exhaust note.
Ideal performance is achieved through expelling exhaust gasses at maximum velocity through a larger internal diameter and a less-restrictive 200 cell catalytic converter. We measured maximum gains of +27 WHP and +46 ft/lbs of torque on our Audi B8 A4 when equipped with supporting modifications.
Audi B8 A4/A5 High Flow Catalytic Converter And 3.0" Downpipe
Audi B8 A4/A5 2.0T Quattro