Hondata modifies standard Honda engine computers (ECUs), adding features and expanding the capabilities of the ECU (e.g. for forced induction). These modifications are available either as a reflash, or a fully tunable system.

Reflashes involve the ECU being sent to Hondata; programmable system require the ECU to be modified for pre-2006 vehicles, or an external programming interface for 2006 and later vehicles.

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