Well you have to get hondata to get the most out of the other parts so it's worth getting early. Even the base reflash will "wake" the car up a little bit.
Plugs into the OBD port under the dash. Then you upload a calibration to the ECU. Theres basemaps in the hondata program but to get the best and mist out of the car a custom tune is highly advised.And it’ll plug right into my stock ECU?