Hello there, been interested in tuning since I got my first car. A 2000 YM Hyundai Galloper Turbo intercooler.

Now I live in the states and I've had this Jetta 1.9 TDI BEW for a couple of years.

I want to modify it heavily, but with ECU tuning, I feel like I will never be satisfied unless I know exactly what's been changed in my car.

Looking to learn the intricacies of tuning an EDC16. Seems like it's a lot more involved than an EDC15.
I've tried to learn something from lurking the internet, but I think I just need to dive in.