No don't worry, I should have been more clear. It'll be the new engine that'll I'll be upgrading 😉
I'm doing as many trips etc on the original engine as possible for the kudos of the mileage etc. However, as I'm never getting rid of the A6 I'm already prepping for a replacement 2.5tdi V6. Which I aim to have heavily tuned. I'll be starting with the 180bhp version first though.