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APR Audi RS4 (B7) 4.2L FSI V8 ECU Upgrade

The APR Audi B7 RS4 4.2L FSI V8 ECU Upgrade is an expertly recalibrated engine control strategy that remaps the timing and air fuel ratios to provide smooth and reliable power as if intended by the OEM. APR's ECU Upgrade is developed to work within the OEM and Tier 1 Supplier specifications for engine component stress tolerances and performance specifications. APR's ECU Upgrades are available in octane specific versions to allow you to take full advantage of the fuel quality available in your area. APR's patented EMCS functionality puts the control of the engine's operation at your finger tips and allows for additional features and options to be installed to your OEM ECU.

Stage I ECU Upgrade

Stage I ECU Upgrade gives you higher peak numbers of 444 horsepower and 372lb-ft. of torque, but also gains of up to 24 horsepower are available at higher rpms! 

  •  ECU Upgrades
  •  A5, S5 & RS5 B8
  •  R8
  •  S4 B7
  •  S4 B8

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