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The K04 Turbocharger system is an APR proprietary custom version of the factory Borg Warner K04-64 turbo originally equipped on the Golf R and S3. The Turbocharger features a CNC-machined, billet compressor wheel and stainless exhaust manifold.


Requirements and Recommendations

Intake System
APR's software is designed to utilize the factory mass airflow (MAF) sensor and housing. The Carbonio Stage I and II Intake System is highly recommended and required to meet the advertised power output. 

Exhaust System
The APR Downpipe Exhaust System is required if the vehicle is not currently equipped with the APR Turboback Exhaust System. APR Recommends the APR Catback Exhaust System for maximum performance.

Intercooler System
The APR Intercooler System is required to meet the advertised power figures.


The APR K04 Turbocharger System greatly increases torque over the factory output levels and as such, an upgraded clutch may be necessary to transmit power to the ground. APR highly recommends upgrading the factory clutch to one that suits the operator's intended driving style.

Exhaust Valve Springs

APR has discovered some engines experience exhaust valve float at high RPM at the advertised horsepower levels due to excessive exhaust backpressure caused by K04’s relatively small turbine wheel. In such cases, APR recommends upgrading the factory valve springs. However, upon request, lower output software capable of producing 321 horsepower and 310 ft-lbs of torque on 93 octane is available.

Spark Plugs
APR's software is designed for use with NGK BKR8EIX spark plugs gapped to 0.024" ±0.002" or 0.6mm ±0.05mm with a change interval of 10-15,000 mi or 16-24,000 km.

APR recommends Michelin PSS and PS2 tires as well as BFGoodrich Rivals and GForce Sport Comp 2 tires.




  •  Turbo Charger Systems
  •  A5, S5 & RS5 B8
  •  TT, TTS & TT RS (MKII)

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