The power figures may not have bugged when compared to the regular Corvette Coupe, but the Grand Sport's performance is certainly improved. You can feel the most obvious improvements, like the 0-60 time that's 3 seconds quicker, the increased grip, and the bigger brakes that bring it back to zero. The other changes, like the dry sump oil system for better lubrication and lower center of gravity, and a battery relocated to the trunk for better weight distribution, won't matter unless you're on a track, but it's nice to know they're there.