How many turns does the Nordschliefe have...70, 71? If you make up a quarter of a second per turn, that equates to, what, a 17 second improvement, give or take. Cut that in half to one-eighth of a second improvement, and we are talking about 8-9 second improvement in total track time.
So, it is entirely feasible.
Current rides: 2010 CTS-V sedan, black raven; 2010 Cadillac Escalade ESV, black raven
Gone but not forgotten: 2008 M5, metallic sapphire black, SMG; 2004 645ci, metallic sapphire black, SMG