CTS TURBO B9 AUDI A4, AllRoad, A5, S4, S5, RS4, RS5 High-Flow Intake System

Our New Air Intake System for the B9/B9.5 Audi A4, Allroad, A5, S4, S5, RS4, and RS5 features a newly designed sealed Rotomolded airbox and air ram air scoop to efficiently direct the outside air into the intake system. Air flows through our high-flow 6" velocity stack air filter before entering the engine through a smooth 3.5" 5-ply silicone turbo inlet hose, helping reduce restriction while maintaining excellent fitment and durability. The enclosed Rotomolded airbox helps isolate the filter from engine bay heat while the CTS Turbo air scoop provides a direct supply of fresh air. All of the components included in the CTS Turbo intake system work together to provide increased horsepower and torque throughout the power band along with a more pronounced induction sound. Turbo spool-up and diverter valve release are also a bit more noticeable. This intake is designed to be efficient in operation, with only a slight increase in sound. Our intake has shown gains of 15HP on a stock vehicle, with tuned vehicles seeing even greater improvements. Features:

• CTS Turbo rotomolded enclosed airbox, utilizing factory mounting location
• CTS Turbo fresh air scoop for cool air supply
• Massive 6" velocity stack air filter
• Easy installation and excellent fitment (couplers are supplied for fitment with 1.8T, 2.0T, 3.0T and 2.9T engines)
• Improved engine performance with reduced turbo lag
• Enhanced induction sound with louder turbo spool and diverter valve release
• Compatible with factory or CTS Turbo inlet pipes for S4 and S5 models

Fitment:

• B9/B9.5 Audi A4 (2017–2025)
• B9/B9.5 Audi A5 (2017–2025)
• B9/B9.5 Audi AllRoad (2017–2025)
• B9/B9.5 Audi S4 (2018–2024)
• B9/B9.5 Audi S5 (2018–2024)
• B9/B9.5 Audi RS4 (2018–2024)
• B9/B9.5 Audi RS5 (2018–2024)

Note: Does not fit vehicles equipped with a MAF sensor. Verify that you car does not have a MAF sensor after the factory airbox.

This part also goes by the following cross reference.

Cross Reference Part Number:

Fits These Vehicles 12 applications

A4

Make	Model	Engine	Years
AUDI	A4		2017–2024
AUDI	A4 (B9)		2017–2024

RS4

Make	Model	Engine	Years
AUDI	RS4		2018–2019
AUDI	RS4 (B9)		2018–2019

A5

Make	Model	Engine	Years
AUDI	A5		2018–2024
AUDI	A5 (B9)		2018–2024

RS5

Make	Model	Engine	Years
AUDI	RS5		2018–2024
AUDI	RS5 (B9)		2018–2024

S5

Make	Model	Engine	Years
AUDI	S5		2018–2024
AUDI	S5 (B9)		2018–2024

S4

Make	Model	Engine	Years
AUDI	S4		2018–2024
AUDI	S4 (B9)		2018–2024

Fitment data last updated: 2026-07-21