CTS Turbo B8 A4 | A5 2.0T K04 Turbo Upgrade Kit

Part# CTS-B8-2.0T-K04KIT

The heart of the CTS Turbo B8/B8.5 A4/A5 2.0T turbo upgrade kit for EA888 Gen 2 with AVL is the Borg Warner K04-0064 turbocharger. This turbocharger is commonly used in OEM applications such as the Audi S3 available in Europe. The highlight of this Borg Warner turbocharger in our kit is the ‘forged mill’ compressor wheel, which brings numerous benefits to the enthusiast. The technology used in the production of these turbos provides us with a variety of benefits, reduced compressor wheel weight (faster spool), increased strength, and greater surface area of the compressor wheel. Because of the ‘forged mill’ technology Borg Warner can increase the effective surface area of the compressor wheel, which results in greater air flow than conventional cast compressor wheels. 

In addition to the Borg Warner K04-0064 the CTS Turbo B8 A4 2.0T turbo upgrade kit uses a set of custom silicon hoses to relocate the factory diverter valve. Our diverter valve relocation uses the same principles as the OEM Audi S3, Audi TTS and Golf R. In addition to the diverter valve relocation our kit includes a new diverter valve housing to relocate the diverter valve, associated OEM gaskets, nuts, studs and hardware and test pipe to connect to your factory downpipe. This kit is by far the best ‘bang for the buck’ modification available for B8 enthustiasts with the 2.0T EA888 Gen 2 AVL engine.


  • 2009-2016 Audi A4/A5 2.0T B8 or B8.5 models
  • 2008-2017 Audi Q5 2.0T



Additional parts required:

  • K04-specific software from any tuning company.


CTS Turbo makes performance aftermarket parts for late-model Volkswagen, Audi, and BMW models. From cold air intakes, catch can kits, performance exhausts, to turbo kits – the CTS Turbo team of engineers and fabricators is working hard to develop the best performance parts for your car.

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