CTS K04 Turbo kit, Audi B7 / B8 A4 A5 Q5 2.0TFSI EA113

CTS Turbo’s K04 turbo kit is a highly capable solution at a reasonable price. Designed specifically for B7, B8, and B8.5 generation Audi A4, A5, Allroad, and Q5 2.0T models, making it a popular choice, for example, as a tuning turbo for the Audi A4 B7!

The selection of smart upgrade turbos for longitudinal engines is surprisingly limited. While models like the Golf MK6R, Audi S3 8P, and similar cars have a wide variety of turbo options, the situation is not as favorable for longitudinal engine setups.

This kit includes a complete, ready-to-use turbo. The foundation is the K04 CHRA frame, paired with CTS’s custom-designed compressor cover and turbine housing. The design is largely based on the factory turbo from the Golf R MK6 but adapted for the A4 platform.

Unlike hybrids that force large CHRAs into small housings, CTS’s solution is designed to maximize airflow and durability. The custom compressor and turbine housings provide reasonable turbo lag and excellent power delivery.

The kit includes all necessary OEM gaskets and mounting hardware.

What’s the output?

With a K04-specific ECU tune and supporting modifications, this turbo can deliver up to 350 HP and 340 Nm of torque from a 2.0T engine. Remember that the K04 turbo requires professional tuning to work optimally, and the fuel system, intake, intercooling, and exhaust must also be appropriately configured for the power levels. You’ll find solutions for all of these from us!

CTS K04 EA113 Longitudinal at a glance:

• CTS K04 CHRA with heavy-duty bearings
• 46.38/56.1 mm K04 compressor wheel (MFS – Billet)
• Custom-designed compressor and turbine housings
• OEM+ manufacturing tolerances for precise fit and durability
• VSR-balanced at high speeds
• Direct replacement for the factory turbo, no additional parts needed
• Includes OEM installation kit (gaskets and hardware)
• Note: Requires proper custom tuning for the ECU.

Compatibility:

• Audi A4 (2006–2009)
• Audi A4 (2009–2016)
• Audi A5 (2009–2016)
• Audi AllRoad (2009–2016)
• Audi Q5 (2009–2017)

Our Recommendations:

• A better-flowing downpipe with a high-flow catalytic converter or decat is a must-have to ensure the turbo works correctly.
• Upgraded intake and intercooler
• For the B7 A4 model, a better HPFP (high-pressure fuel pump) and larger direct-injection injectors are needed depending on the power target.
• In some models, minor trimming of the factory coolant line bracket may be necessary.

Additional Information:
Check here: Turbo Installation Guide from the Manufacturer