Thanks for the response, I believe that answers my question. I'm not an expert but I was just wondering if I would run into problems with compatibility. My MIB unit came out of a 2017 with Fender audio, however my GTI didn't have any premium audio. It was a bit of a hassle to have the unit coded to match the car (2-door, without amplifier) but we eventually loaded a sound file that worked.
My question was just asking if I'll run into problems with adding a helix into the equation. I'm sure it's fine as you mentioned. I'll probably wait for the dongle rental as you suggested, I believe it's about 100$ for the dealership to do it.
Edit; Was looking through your content, and
this somewhat answers the question. It may have something to do with the loads (you touched on the MIB1 vs the MIB2 oriented files). I'll try 56/96 respectively to see if there's any difference for my MIB2 retrofit. Not sure if if the difference will be greater than than you found in your test due to the
2-door vs 4-door model. As always thanks for your in depth content exploring some of these questions, been following your stuff for a while.