-To the OBDII port or directly bank loaded to stock ECU.
They have more users, more feedback for tuners – geographically speaking, and they generally are easier to get technical support & updates. (hondata,Ktuner,etc.)
-For this car, it will be suicidal (warranty wise) to do a custom tune with an aftermarket ECU / controller. Unless you’re loaded $$$ & can keep up with your tuner’s mistakes getting your ride dialed in.
- Piggy-backs are good options sometimes, I just personally leave them as the last resource.