Vantage V8 achived 8.03min time on Nordschleife with Pirelli Corsa semi-slicks. 997S coupe(PCCB,-20mm/LSD) time was 8.05min with normal Michelin tires. If you fit Corsa's on 997S it will be around 4-5s faster on Nordchleife. With normal tires(Bridgestone) V8 Vantage time is around 8.10min, AM is still not offering semi-slicks as option...
BTW, these times were achived by Horst v. Saurma-german Sport Auto magazine.