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APR Audi B7 S4 4.2L V8 ECU Upgrade

The APR 4.2L 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

Expect 352 HP and 312 FT-LBS with 93 octane. 91 octane mode only modifies the speed and rev limiter.

  •  ECU Upgrades
  •  R8

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