Just a quick one on the DV, if there’s no history of this being done, change it ASAP.
I just bought my first mk5, and I knew it was down on power having owned fairly quick cars in the past. It didn’t feel like it had any boost.
Changed the DV (which was torn to shreds) and now it flies, you can feel the turbo boost whereas before it felt NA. I reckon it was at least 40/50 bhp down on power.
The guy who owned the car before me had it for around a year, must have never driven it with it’s full power. Must be countless mk5 owners out there like him.