My money's on injectors. They are noisy. Your vid gets loads of clicking when you go down one side over the intake. FWIW, I went over my first GS for the loud clicking with my mechanic's stethoscope. It was the injectors. I remember taking the top off the air box off a injected Fiat Cinqecento I bought daughter #3 to learn in. It took a minute or so to realise the horrible ticking noise was the single-point injector doing its stuff.
