The CTS Turbo Stainless Steel Catback Dual Exhaust Audi S4 3.0T B8 09-16 for your 2009-2016 Audi S4 is a great way to increase horsepower and torque gains by replacing your restricted factory car exhaust system.

The CTS Turbo Stainless Steel Catback Dual Exhaust Audi A4 2.0T B8 09-14 for your 2009-2014 Audi A4 is a great way to increase horsepower and torque gains by replacing your restricted factory car exhaust system.