The 2013+ Acura ILX comes from the factory with an ECU that has flash memory. This allows the ECU programming to be changed with a reflash. No physical modification to the ECU is needed. Simply select the appropriate hardware/software needed in order to complete the reflash.
The Hondata FlashPro for 2013+ Acura ILX allows you to reflash and tune the ILX directly over the OBD2 diagnostic port:Hondata FlashPro 2013+ Acura ILX