CTS TURBO B9 AUDI A4/A5/ALLROAD HIGH FLOW CAT

CTS Turbo High Flow cat for your Audi A4/A5/ALLROAD/Q5 1.8T & 2.0T. Our high flow cat is designed to seamlessly fit in place of your restrictive stock catalytic converter, which is situated immediately after the turbocharger. We have redesigned our test pipe and high flow cat to both retain the same exterior shape and design for customers wanting to have a stealthy test pipe install. Our high flow cat features 3″ stainless steel piping, one 02 sensor bung. Substantial power gains, improved exhaust flow and a more throaty sound are the main benefits from installing our high flow cat.  Upon inspection you will notice a flare which is nearly 4″, this flare then tapers to 3″ and is designed to allow for optimal flow as the exhaust gas transitions from the turbocharger to the high flow cat.  In addition to being one of the best bang for the buck performance upgrades for B9 owners our high flow cat is also very attractive piece.  Each 3″ test pipe is hand tig welded. Product Details: – T304 stainless steel construction – Fully tig welded design – Throaty sound – Great power upgrade To remove the CEL that will occur, proper tuning software must be used. Use of stage 2 software upgrade is strongly recommended. Fitment:

• 2017 - 2019 Audi A4 1.8T/2.0T
• 2017 - 2019 Audi A5 1.8T/2.0T
• 2017 - 2019 Audi Allroad 1.8T/2.0T
• 2018 - 2020 Audi Q5 2.0T

DOES NOT FIT RIGHT-HAND DRIVE DOES NOT FIT GEN 3 ROW EA888.3 DOES NOT FIT 2020+ MODELS WITH V-BAND CONNECTION AT THE TURBOCHARGER

This part also goes by the following cross reference.

Cross Reference Part Number:

Fits These Vehicles 8 applications

A5

Make	Model	Engine	Years
AUDI	A5		2017–2020
AUDI	A5 (B9)		2017–2020

A4

Make	Model	Engine	Years
AUDI	A4		2017–2020
AUDI	A4 (B9)		2017–2020

ALLROAD

Make	Model	Engine	Years
AUDI	ALLROAD		2017–2020
AUDI	ALLROAD (B9)		2017–2020

Q5

Make	Model	Engine	Years
AUDI	Q5		2018–2020
AUDI	Q5 (B9)		2018–2020

Fitment data last updated: 2026-06-30