WARNING! THIS PRODUCT IS FOR OFF-ROAD MOTORSPORT/COMPETITION RACING USE ONLY, NEVER TO BE USED ON ANY POLLUTION CONTROLLED MOTOR VEHICLE. KTuner complete ECU package for the 2003-2005 Accord 4-cylinder chassis. This ECU package includes our KTuner 03-05 Accord ECU with a fully installed and tested complete KTuner End User Board System. You will not find a better solution for tuning your 03-05 4-cylinder Accord. Please select if you have a manual transmission or automatic transmission from the drop-down menu. Includes: A Motorsports KTuner Ready 03-05 Accord RAD ECU KTuner End User System. (fully installed and tested in ECU) USB cable for connecting the ECU to your laptop. KTuner software for operating/tuning the ECU. Please download the software here. What else do I need to use this ECU? Laptop computer running Windows XP or newer Windows operating system Internet connection when connecting to your ECU for the first time to register your system and setup a KTuner account (free). To see what is involved in setting up your KTuner account, see the KTuner getting started guide here. What engines can this ECU be used with? K24a4 (factory engine in the 03-05 Accord) Other K series engines (ie: K24a2, JDM K24a, etc.) Must use a cable-operated throttle body Bluetooth option: The KTuner Rev1 End-User board accepts the KTuner Bluetooth Add-On Module. What features does the KTuner software for 03-05 Accords have, and what can I adjust? Real Time logging Injector sizing Ignition/Fuel tuning VTC tuning Knock tuning Adjustable rev limiter settings Adjustable 2-step launch control Custom/aftermarket MAP sensors Expanded tables for boost support VTEC engagement control Closed loop/open loop control Disable engine sensors and OBD2 monitors Disable ECU immobilizer Fuel cut parameters Fuel correction parameters Ignition correction parameters Idle control parameters Many more under development! Many features are being developed for the KTuner software. For an up-to-date list of all features, see the KTuner page here: http://ktuner.com/accord0305/