Buy
Continental ExtremeContact DWS06 PLUS or SportContact 6 if you want Summer only
I ran the DWS6 on my 2019 Grand Sport and was amazed at the traction, smoothness and quiet road sounds. (NOT run flat however)
The DWS will be my next tire on my C8 for touring and comfort, I don't track my car.
TSB or no TSB this doesn't give ANY dealership the right to break the law on the roads or drive recklessly. (115km in a 50km zone ..really?) What he said about the car needing this according to a TSB is Bull$#it!
And the brash attitude of "doing you a Favour" shows they have no respect for you...
I Originally bought this EOS wing My dealer installed it for me. It cracked in a couple months by the fin on the wing, I had it replaced under warranty and second one cracked again same place. I bought a GM original part (what I should have done in the first place) No issues in 2 years.