Black B8 S4 Avant baiting 997 911 C4S on A435 near J3 M42

[neckarsulm]

This was around 2 weeks ago at around 5pm on A435 dual carriageway north of J3 M42.
Pulled in at 'cock' distance behind me on a pretty empty dual carriagway in the dark, looked like a TDI although it was dark, LED drls so poss S line.
However when I didn't take the bait he pulled into outside lane and shot past very rapido and that was when I spotted S4 badge on boot lid
Confused me as I had just overtaken a grey B8 TDI Avant
Looked remap quick but then it also looked like a TDI, ideal if you are into that sort of thing (I'm not)