there is no material change from 2017 to 2019. Starting 2017 and carried forward changes in the supercharger lid for better cooling over the rear cylinders. and the m7 for 2017 benefited from some additional cooling changes the a8 didn’t get. You’ll be fine on the street. The cars do run mighty hot but don’t over heat. They are prone performance wise to heat soak. You can tell this even on the street. The c7z’s have a horrendous big brother tune that zaps the power and the intercooler tank is prone to cavitate on all years which pulls a lot of power when it happens and is difficult to fill and get airpockets out of. A horrible design of a system so critical to performance on a supercharged car. The cars don’t really run that great above 5000 maybe to 5300 rpm. They peter out up high. Your wasting time holding the lunk of a motor to redline.

Down low the torque is very good especially when the car is first started at luke warm operating temps.

I feel Overall the car is more like a big 2 door heavy Cadillac (not really a bad thing) then a sports car.

With the grand sport you have all the doo dad look of a z06. You’d be better off throwing a magnuson 2300 supercharger and tune for 5k on your grandsport then trading for a z06. You’ll save a ton of money , save sales tax on the delta difference and save personal property tax and your grand sport would blow the doors off a stock blower z06.

A bigger supercharger is what the z06 needs and what a lot of z06 owners including me are planning to do because the tiny supercharger on the z06 really chokes these cars.