The Injen SP Short Ram Cold Air Intake System Wrinkle Red Audi S4 | S5 Turbo 18-22 for your 2018-2019 Audi S4 is a great way to increase horsepower and torque gains by replacing your restricted factory air intake.

The Injen SP Cold Air Intake System 2010-2016 Audi S4 V6-3.0L Supercharged for your 2010-2017 Audi S4 is a great way to increase horsepower and torque gains by replacing your restricted factory air intake.

The Injen SP Cold Air Intake System 2010-2016 Audi S4 V6-3.0L Supercharged for your 2010-2017 Audi S4 is a great way to increase horsepower and torque gains by replacing your restricted factory air intake.

The GruppeM Carbon Fiber Ram Air Intake System Audi S5 8T 08-11 for your 2008-2016 Audi S4 is a great way to increase horsepower and torque gains by replacing your restricted factory air intake.

The GruppeM Carbon Fiber Ram Air Intake System Audi S4 | S5 2009-2022 for your 2009-2022 Audi S4 is a great way to increase horsepower and torque gains by replacing your restricted factory air intake.

The Eventuri Black Carbon Intake System Audi B9 S5 | S4 2017-2023 for your 2017-2022 Audi S4 is a great way to increase horsepower and torque gains by replacing your restricted factory air intake.

The CTS Turbo Air Intake System Audi B9 A4 | S4 | A4 Allroad | S5 | A5 | RS4 | RS5 2017-2023 for your 2017-2022 Audi S4 is a great way to increase horsepower and torque gains by replacing your restricted factory air intake.