2015 Volkswagen Golf — first HPDE in a stock street car — Raleigh owner

That's a good start, but I wouldn't stop there. If it still isn't clear on the 2015 Volkswagen Golf, a specialist hour can be cheaper than another round of parts. That's where I'd start. Happy to compare notes if your setup is different. I'm in no rush to be a hero on it.

Same neighborhood, different next step: A second data point from another 2015 Volkswagen Golf owner helps more than a generic diagnosis. Then you'll know the next fork. I'd want that in writing, not as a promise. I'd sleep better after that step, even if it finds nothing. Might be overthinking it, but I'd rather overthink than overspend.