APR Audi R8 5.2L FSI V10 ECU Upgade! APR is pleased to present the ultimate ECU Upgrade for the Audi R8 5.2L FSI V10 engine. After months of long nights and many hours of testing, development and more testing, we are pleased to offer you an ECU recalibration that is second to none. APR's extensive research and development provides you with a powerful ECU Upgrade with no loss of drivability or reliability. Expect increases in power across the entire power band, improved throttle response and a smoother, more powerful top end. The APR Audi R8 5.2L FSI V10 ECU Upgrade is an expertly recalibrated engine control strategy that remaps the timing, air fuel ratios and other engine management paramaters 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. The Audi R8 GT and Lambororghini Gallardo Superleggera offer OEM ECU Calibrations for the same 5.2L FSI V10 to achieve power levels as high as 570HP. APR's first opportunity was to equalize the R8 V10's calibration with the higher output versions. APR Stage I offers +59 HP @ 7950 RPM and +53 TQ @ 3350 RPM over stock with only an ECU upgrade and no other modifications. Please visit our ECU Upgrade Product Page for a full report including 91/93 octane dyno graphs represented as crank and wheel power.