APR Audi B8 RS4 & RS5 4.2L FSI V8 ECU UpgradeEAPR42V8RS5
Regular price $799.99
After months of long nights and many hours of testing, developing and more testing, were pleased to offer you an ECU recalibration that is second to none. APRs extensive research and development provides you with a powerful ECU upgrade with no loss of drivability or reliability. Expect faster acceleration, improved throttle response and more power across the entire power band. APRs 4.2L FSI V8 ECU Upgrade is an expertly recalibrated engine control strategy that primarily remaps the engines air fuel ratio and ignition timing, within the factory ECU, to provide smooth and reliable power as if intended by the OEM. APRs ECU Upgrade is developed to work within the OEM and Tier 1 Supplier specifications for engine component stress tolerances and performance specifications. Available in octane-specific variations, APRs calibrations allow you to take advantage of fuel quality available in your area. APRs patented EMCS functionality puts the control of your engines operation at your fingertips and allows for additional features and options to be installed to your OEM ECU. APR Stage I ECU Upgrade The APR Stage I ECU Upgrade gives you higher peak numbers of 458 HP/330 FT-LBS on 93 (R+M)/2 octane and up to 466 HP/335 FT-LBS on 100 (R+M)/2 octane race fuel. As much as 18 HP and 16 FT-LBS of torque are available through the power band. APRs ECU Upgrade is the best power per dollar modification for the new 4.2L FSI V8 and gives it just the extra edge these cars lack from the factory without pushing the limits. With factory-like smoothness and drivability, APRs ECU upgrade will fill the void in an otherwise excellent car.