CTS Turbo 2018+ B9 Audi S4/S5 V6T 3.0T (EA839) Test Pipe

Stop letting the factory cat strangle your B9 S4 or S5 3.0T. The CTS Turbo EA839 cat-delete test pipe is CAD-developed to drop perfectly into the OE location and maximize exhaust flow for the biggest gains. It is manufactured from T304 stainless, hand TIG-welded and back-purged for years of reliable service.

It also makes the car sound like an S-car should: a sporty growl with a pronounced crackle on downshift and a confident braappp through all 8 gears, louder still with an aftermarket exhaust.

What you get

• Developed and tested on a real car in the real world
• T304 stainless steel, TIG-welded and back-purged
• Replaces the restrictive factory catalytic converter
• Install hardware included (gaskets not included)
• Strong power gain with uncompromising performance
• Sporty note that stays subtle when cruising
• No drone with the factory exhaust
• Stunning polished finish

Fitment

• 2018+ Audi S4 3.0T (EA839)
• 2018+ Audi S5 3.0T (EA839)

A CEL will appear without proper tuning software, so a stage 2 software upgrade is strongly recommended — CTS Turbo also recommends a high-flow cat for the sake of the environment. Note that CEL eliminators and oxygen-sensor spacers do not work on the B9 S4/S5.

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.