It does feel sluggish and has a weird sound, so I'm thinking it is that. I found
https://www.dmgrs.co.uk/collections/...-lkg100300-oem
that at DMGRS
But then I saw this:
https://www.dmgrs.co.uk/collections/...sket-lkg100551
which looks different.
It's a 2004 R75 1.8T. Which I think makes it a K series engine.