RATATTAK

Sounds like the high pressure fuel pump to (non-mechanic) me.

What fuel do you guys put in your RS models ? ... my son has just bought a '21 RS 5 and the fuel flap lists E5 and E10 but I think he'd be better off putting E5 in it.

Thanks for the welcome Jason ... I'm currently looking at RS models, maybe a 4 or 5 or 6 Avant or Sportback.

Just joined but haven't bought my Audi yet ... I bought an A1 for my granddaughter just before Christmas and my son is currently buying an RS5, so I thought I'd join the club.   I run a 911 Turbo and a CL500, and I'm considering a fast Audi to replace the Mercedes.