Audi B9 S4/S5 CTS Turbo High Flow Downpipe

CTS Turbo B9 S4/S5 3.0T (EA839) high flow cat is made to maximize exhaust flow for highest power gains. Do not compromise performance and sound with factory parts – unleash your B9 S4/S5 3.0T potential!

Designed using the latest in CAD technology; this part is made to fit perfectly in place of restrictive factory catalytic converter. Manufactured from T304 stainless steel, hand TIG welded and back-purged to ensure years of reliable performance.

In addition to unleashing the power and performance of your 3.0T, the CTS B9 S4/S5 3.0T EA839 high flow cat will make your vehicle sound like an S-car really should. When installed with factory exhaust it produces a sporty growl with much more pronounced exhaust “crackle” on downshift. While up-shifting you will enjoy a confident “braappp!” as you bang through all 8 gears. The sound will be even louder if you already have an aftermarket exhaust system.



Designed and tested on a real car in the real world.

T304 stainless steel, TIG welded back-purged construction.

Replaces restrictive factory catalytic converter.

Great power upgrade with uncompromising performance.

Incredible sporty exhaust sound, subtle when cruising.

No drone with factory exhaust.

Stunning polished finish for great looks.