CTS Turbo High-Flow Cats - Audi B8 A4/A5/Allroad/Q5

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CTS Turbo B8/B8.5 Audi 1.8T/2.0T High Flow Cat is the premier high flow cat pipe for your Audi A4/A5/Allroad or Q5.

Our B8/B8.5 High Flow Cat is designed to seamlessly fit in place of your restrictive stock catalytic converter, which is situated immediately after the turbocharger.  Our B8/B8.5 High Flow Cat features 3″ stainless steel piping, smooth mandrel bends, two 02 sensor bungs with an option for a third.  Substantial power gains, improved exhaust flow and a more throaty sound are the main benefits of installing our B8/B8.5 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 B8/B8.5 High Flow Cat.  In addition to being one of the best bang for the buck performance upgrades for A4/A5 owners, our cat pipe is also a very attractive piece.  Each 3″ B8/B8.5 High Flow Cat is mandrel-bent, hand tig welded.  Do you need an additional 02 bung for data logging?  Well, that’s no problem!  Extra 02 bung is now included at no extra charge.


  • 3″ high-flow cat
  • T304 stainless steel construction
  • 200 cell stainless steel high flow cat
  • Mandrel-bent stainless steel
  • Fully tig welded design
  • Extra O2 bung for wide-band installation
  • Install hardware included
  • Great power upgrade

What's Included:

  • CTS Turbo High-Flow Cat

Fitment Details:

  • 2009 – 2016 Audi A4 2.0T
  • 2009 – 2016 Audi A5 2.0T
  • 2009 – 2016 Audi AllRoad 2.0T
  • 2009 – 2017 Audi Q5 2.0T
  • 1.8TFSI EA888 Gen 1 and 2.0TFSI EA888 Gen 2 ONLY!
  • Does not fit late ROW cars with EA888 Gen 3 engine.
  • Only fits LHD vehicles. Fits manual and automatic transmissions, does not fit CVT.

To remove the CEL that will occur, proper tuning software must be used. CTS Turbo recommends choosing a High Flow Cat for the sake of our environment!

Use of stage 2 software upgrade is strongly recommended.

Fitment for factory turbo, CTS-TR-1070, CTS-TR-1070X and CTS B8 BOSS kits.

Vehicle Fitment

Model   + Drivetrain  
80A Q5 2.0T I4
B8 A4 2.0T I4 +
B8 A5 2.0T I4 +

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