Focus RS onboard with me at Anglesey Coastal Circuit on some old Michelin Pilot Super Sports.

With new tires and a few adjustments from the driver side I think I could take nearly 1s out of my time.
I don't think there will be much more performance left after that. 

Still a fast lap at 1.21.06.... For reference and out of EVO magazine;

BMW M4 - 1:19.2
BMW i8 - 1:19.4
Honda Civic Type R (FK2) - 1:19.5
Renaultsport Mégane Trophy 275 - 1:19.6
BMW M5 Competition Pack - 1:19.7
Audi TTS (Mk3) - 1:19.9
Audi R8 V8 (Mk1) - 1:20.1
BMW M135i - 1:20.4
Nissan 370Z Nismo - 1:20.5
Alfa Romeo 4C - 1:20.7
Mercedes-AMG S65 Coupe - 1:21.4
VW Golf R (Mk7) - 1:21.6