2024 Volkswagen Golf R — alternator whine after adding amplifier and DSP

If it were in my driveway, move a coil or plug on the 2024 Volkswagen Golf R if it's cylinder-specific and see whether the code follows. You'll know quickly if you're on the wrong tree. This is from a 2024 Volkswagen Golf R in Nationwide with 30,500 miles. Keep sale price, fees, and rate as three different conversations. This is me being the wet blanket on purpose.

Ask what changed right before it started. Capture voltage while the 2024 Volkswagen Golf R is actually failing — after it restarts you've lost the clue. Save the big job until that test fails. Learned this the expensive way on a previous car. I refuse to clear codes until someone else sees them.