APR K04 Turbo Upgrade for the A4 B7 2.0T FSI

APR's S3 K04 Turbo Conversion is now available for the B7 model generation Audi A4 2.0T FSI. APR has developed an excellent entry level turbocharger upgrade for the 2.0T FSI engine by incorporating the OEM turbocharger assembly from the Audi S3 and coupling it with APR’s FSI Fueling Technology and expertly recalibrated engine management upgrade. APR's Engineering Team has developed a powerful and reliable turbocharger upgrade that maintains OEM engine bay appearance and offers up to 118 hp and 131 lb ft of torque over the OEM power output of the 2.0T FSI.

APR's engineers have expertly recalibrated the engine management system to allow for nearly flat torque delivery from 3000 RPM to 5500 RPM which results in a smooth linear pull throughout the power band. Keeping the track enthusiast in mind, this conversion package will not result in overpowering of the driveline but will allow for smooth acceleration to easily maintain control while cornering.

The Borg Warner K04 turbocharger selected by VAG engineers is perfectly sized for the 2.0 liters of displacement to allow for stout horsepower numbers as the RPMs increase with no dramatic fall off as redline approaches. This ensures plenty of power in the high RPMs for continued acceleration in the straights and positioning at the healthiest portion of the power band after corner exit.

Featuring APR's Patented EMCS program switching functionality and DirectPort Programming, APR's Engine Management Calibration for this conversion package allows for a range of Octane and situation specific calibrations to be installed simultaneously on your vehicle's ECU. These programs and features are able to be cycled through via your existing factory cruise control and activated in less than 20 seconds. You will be able to choose 1 to 4 Programs listed below.

S3 K04 Conversion Package

S3 K04 Conversion Package

Turbo Installed

S3 K04 Turbo Insalled
Program Mode Horsepower Torque RPM Limit Speed Limit
*It is essential to ensure your vehicle is filled with at least the minimum octane rating for each Performance Calibration when activating the program.
¹Figures created using Stock Intercoolers, Full APR Exhaust with Testpipe and APR/APR Carbon Fiber Intake
Stock - OEM Operation 200 HP 207 LB-FT 6800 RPM 127 MPH
APR 91 Octane (R+M)/2 312 HP¹ 328 LB-FT¹ 6800 RPM Unlimited
APR 93 Octane (R+M)/2 318 HP¹ 338 LB-FT¹ 6800 RPM Unlimited
APR 100 Octane (R+M)/2 TBA TBA 6800 RPM Unlimited
APR Valet Limited Output Limited Output 4500 RPM 70 MPH
APR dyno
APR dyno

Requirements and Recommendations

  • Fuel Injectors
    Bosch OEM High Flow Injectors are required.
  • High Pressure Fuel Pump
    The APR High Pressure Fuel Pump is required.
  • Exhaust System
    A high flow downpipe exhaust system is required.
  • Intake System
    APR's software is designed to utilize the factory mass airflow (MAF) sensor and housing. An Intake System is highly recommended and required to meet the advertised power output.
  • Intercooler System
    APR highly recommends an upgraded intercooler system to meet the advertised power figures.
  • Transmission
    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.
  • 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.
  • Fluids
    APR recommends Motul Fluids and Lubricants.

Turbocharger Loyalty Program

We’re pleased to announce the turbocharger upgrade path just got a little easier for our loyal APR customers. If you’ve purchased an APR ECU Upgrade and want to upgrade to one of our turbocharger systems, you can take advantage of fantastic savings! It’s our way of saying “thank you” for enjoying our ECU Upgrades before stepping up to the big leagues! To see the savings, look over the pricing tiers below. Pricing also includes a fully loaded APR ECU, where applicable!

Please Note: An APR Dealer MUST check software availability and compatibility before purchase.

Application Guide - (Includes Software)
Vehicle Engine Transmission Drivetrain Part Number APR Loyalty
Discount Price²
²Learn about the APR Turbocharger Loyalty Program Here
Audi A4 2.0T FSI 6MT & Tiptronic All T2100009$2,999.99$3,299.99Locate an APR Dealer
Pricing - Software Only
Stage Minimum Requirements Price
- Pricing: Please contact an APR Importer for pricing outside the USA.
- Program Switching: A fully loaded ECU includes up to 4 program modes (stock mode, performance modes, valet, etc), as well as fault code erase, security lockout and anti-theft depending on availability and ECU compatibility.
- Availability and ECU Compatibility: Stages, programs, and features may not be available for all ECUs.
- ECU Revision Notice: Multiple ECU revisions exist for each platform. APR software may be temporarily unavailable when factory updates are applied. An APR dealer can check availability in person, or over the phone if the ECU boxcode/revision is known.
APR K04 ECU Upgrade (Existing APR ECU Upgrade Customer) APR K04-64 Turbocharger and See Requirements and Recommendations Above $299.99
APR K04 ECU Upgrade (New APR ECU Upgrade Customer) APR K04-64 Turbocharger and See Requirements and Recommendations Above $899.99
- Add APR EMCS Program Switching (Fully Loaded) None $149.99

How to purchase

APR DealerPlease use the APR Dealer Locater Tool to locate an APR Dealer, confirm availability and schedule an appointment.

Please note vehicle manufacturers issue many ECU part numbers and revisions throughout their vehicle lineup. As such, some ECUs may be temporarily unavailable as new parts and/or revisions are released. If the vehicle’s ECU part number and revision is known, availability can be checked at any APR Dealer.

APR Tuned

Phone: (800) 680-7921 Local Phone: +1 (334) 502-5181 Fax: (334) 502-5180 Address: APR LLC, 4800 US HWY 280 West, Opelika, AL 36801

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Notice: Products that affect emissions and do not carry a California Air Resources Board Executive Order are not for sale in California, USA. While we try to keep everything current, APR LLC is not responsible for errors in pricing on this web site. All prices are in USD and are applicable to the United States of America only.