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The Turbo Engineers(TTE)

TTE Audi 2.7T Turbocharger Upgrade TTE380+ (B5 S4 & C5 A6 Allroad)

TTE Audi 2.7T Turbocharger Upgrade TTE380+ (B5 S4 & C5 A6 Allroad)

Regular price £1,871.30 Inc. VAT
Regular price £1,969.79 Sale price £1,871.30 Inc. VAT

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TTE380 is our hybrid performance plug & play upgrade turbocharger step for the B5 S4 2.7T. RS4 power with great spool and response, but fitting as K03 so no extra costs or hassle.

Please Note: This turbo upgrade is available as a new unit. Most used ko3 turbos will 99% be cracked, this is the reason we never offer to rework old original k03 turbos now.

Engineered & Enhanced

To make a pair of TTE380 Turbo’s, we start out with Genuine BorgWarner S4 K03 units and change the original cast compressors for larger and more efficient milled billet type compressor wheel that features extended tip technology and CNC mill the compressor cover to optimum gap to match the new compressor larger profile. Clipped and lightened turbine for greater gas flow. We CNC modify original compressor cover inlet, for increased airflow.

The clipping of the turbine is a special TTE grinding process to the turbine blade tips. Curved to alleviate stress from process. Clipping reduces blade area thus increasing gas flow and so reducing back pressure and lowering exhaust gas temperatures, allowing safer higher boost level. This process also gives a secondary advantage of removing some material, lightening a already lightened turbine thus reducing rotational mass improving moment of inertia.

Special profile 360 deg high performance motorsport Genuine BorgWarner journal bearing system are fitted, to remain durable at higher loads with no loss in transient response.

Actuators used are Genuine BorgWarner OE units for trouble free operation.



Precisely balancing our turbochargers is a key critical factor to become a TTE upgrade unit as longevity and performance are paramount. Good balance improves acoustics also. Subsequent great care is taken with all TTE turbochargers to achieving our balance standards. Firstly parts are balanced at slow speeds up to 2800RPM in multiple planes using our single parts machine, then components are assembled and then the CHRA are dynamically balanced, but this time depending on application at up to 250,000 RPM in multiple planes using our in house VSR machine to acquire the ultimate equilibrium, to a standard far higher than OEM. Each turbocharger is supplied with serial numbered balance test result document.



  • TTE Latest billet compressor geometry
  • TTE Genuine BorgWarner K03 turbine/shaft, Clipped and lightened
  • Genuine BorgWarner modified housings
  • Genuine BorgWarner Actuators
  • Genuine BorgWarner Reinforced Motorsport bearing system
  • Optimized clearances
  • Plug & Play installation
  • Single parts finely balanced then components assembled and core high-speed VSR balanced
  • Supplied with serial numbered balance test result document for each turbo
  • 380PS+ Capable
  • Designed, Machined & Built by TTE in Germany

  • Audi B5 S4 2.7T
  • Audi A6 Allroad C5 2.7T

To ensure the part(s) you have ordered fits your vehicle, we run a compatibility check prior to dispatch. We can do this either using your registration number(UK) or the last 7 digits of your VIN. Simply enter your car details prior to checkout.




Upgraded by

TheTurboEngineers (TTE)


One year TTE warranty.



Our new turbos are made to order, the estimated delivery time is also 3-4 weeks after receiving your order. 



TheTurboEngineers GmbH based in German is a dynamic and highly innovative turbocharger engineering company, specialised in production of motorsport turbochargers to the highest quality and greatest efficiency with attention to detail. Every component is optimised on long term reliability.

TTE are focused on the construction of prototypes from a concept, through to completion with all work mostly being done in-house to TTE's extremely high standards in Germany. TTE is a fine example of German engineering at its best. 

Small details are important to TTE, as is the conversion of existing OE turbochargers to new upgrade specifications, be it new or from a supplied used turbocharger.
TheTurboEngineers GmbH consults and provides to race teams and many well known tuning houses, looking for the best engineered performance turbochargers available.


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