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

The CTS Turbo high-flow cat is the premier upgrade for the B9 Audi A4, A5 and AllRoad 1.8T and 2.0T. It drops straight in where the restrictive factory catalytic converter sits — right off the turbocharger — for real power gains, better exhaust flow and a throatier note. CTS redesigned the test pipe and high-flow cat to share the same exterior shape, so the install looks stealthy. A near-4" flare tapers to 3" for a clean exhaust-gas transition out of the turbo, and each 3" piece is hand TIG welded.

Product Details

• 3" stainless steel piping with one O2 sensor bung
• T304 stainless steel construction
• Fully TIG welded design
• Throaty sound
• Great power upgrade

Proper tuning software must be used to clear the CEL that will occur; a 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
• Does not fit right-hand drive
• Does not fit Gen 3 ROW EA888.3
• Does not fit 2020+ models with a V-band connection at the turbocharger

Emissions disclaimer: This product is not legal for sale or use on pollution-controlled vehicles operated on public roads and is intended for off-road, race, or closed-course competition use only. You are responsible for compliance with all applicable emissions laws; use on public roads may violate the Federal Clean Air Act (42 U.S.C. § 7522) and similar state laws. Please check your local laws before purchase and installation.

Ships from our Vancouver shop — KORE SPEED is proudly Canadian-owned, with no surprise cross-border duties for Canadian buyers. Questions on fitment? Email support@korespeed.com.