The Corvette Grand Sport is well known and overachieves for its power. Think of it is a Z06 without the blower torque and without the added weight on the nose. It's a tremendous car.
So which of these two is quicker around the track? Well, they are so close it will come down to the conditions, transmission, and ultimately the driver.
The dual clutch 991.2 GTS edges the manual C7 Grand Sport by just over 3/10's:
sport auto-Testredakteur Christian Gebhardt im Porsche 911 Carrera GTS (Rundenzeit: 1.08,0 min) und Corvette Grand Sport (1.08,3 min) auf dem Kleinen Kurs Hockenheim. Reifen Porsche: Pirelli P Zero Corsa N0, Corvette: Michelin Pilot Sport Cup 2 ZP.