Thanks for the response!Besides the wide body factory flares and wider rims/tires, the Grand Sport upgrade has pretty much the Z51 suspension package. It's like a Z06 without the big 505 HP LS7 motor. The Automatic transmission version that I have doesn't have the dry sump or the hand built motor that the manual transmission version has, but otherwise, as far as I know, has all the trim and suspension upgrades that you'd find on a Z06. I guess GM feels tha tif you'll deal with pa paddle shift automatic trans, you don't deserve the more advanced dry sump or the attention of the hand built motor. Interestingly, for the 2012 C6, there were a bit over 11K Corvettes built and nearly half were Grand Sports according to what I can find:
I just sold off my 2013 2LT base model and still have my 2012 Grand Sport (my starter Vette). I owned the both for a couple months, so have a good basis for comparison. The 2013 base 2LT is a competent car and a comfortable touring car. It's fast, handles well and stops well, but I never tracked it. The Grand Sport (no Magna Ride) transmits more road feel (rougher ride), but handles more like a slot car when cornering and has amazing brakes. While both have an LS3 and the same rear axel ratio (both automatics), the Grand Sport feels quicker. Maybe that's a function of more rubber on the road from the wider tires?
Besides the more aggressive styling and wider rim and tires, I think the overall experience of driving the Grand Sport is a better representation of what driving a Corvette should be like to me. The base model is comfortable and competent for casual driving. The Grand Sport is more focused on being a Sports Car vs just a Grand touring ride. It demands a bit more attention when driving. Mine is a 2LT trim in Velocity Yellow and I love it!