RAD-Spec ECU with R1 Headers (4-Cyl Manual)

The KTuner ECU is a high-performance engine control unit tailored for K-Series Honda engines, specifically the RAD-Spec for 2003-2005 Accord models with a 4-cylinder, manual transmission. This unit comes with R1 headers pre-installed directly into the ECU, streamlining installation and tuning potential. For 03-04 Accords, it is necessary to use an ECU from a 2005 Accord model or a factory replacement ECU to ensure compatibility. If using an ECU other than the factory original, the immobilizer light may flash on the dashboard. This can be addressed by disabling the immobilizer in the software or having the ECU synced to your vehicle's immobilizer by a Honda/Acura dealer. It is crucial to unlock the KTuner unit before any VIN number changes are made by the dealer to maintain communication. This ECU requires programming with a KTuner system to unlock its full potential for performance tuning. While the KTuner board is not included with this specific ECU, it is essential for custom tuning and data logging. The KTunerECU End User System allows users to datalog and make their own modifications, while dealer tuning services offer professional calibration. KTunerFlash units are not compatible with these specific ECUs.