I feel l need to update my assessment given that I have a few more miles on the Corsa and since I have had to deal with their customer service.
First, since the reso delete install, and after a few additional break-in miles, the exhaust has really come alive. It is a lot closer to where I thought it should be. Cold starts sound fantastic. I can hear it while "giving it the beans". Cruising is still a comfortable no-drone zone. Credit to FCA on that part, they did a great job sound deadening the interior (IMO). One of these days I will trade out these Atturos for some Ridge Grapplers and reduce tire noise as well.
Second, and arguably more important, Corsa's customer service has been extra stellar. They have a lifelong customer for sure. My exhaust arrived with a small ding due to shipping and they were ready and willing to warranty replace it on the spot. I didn't end up going that route, so they hooked it up with a discount on the next part I bought. Had some issues with the powder coating on the black tips chipping from the inside, and they are warranty replacing those with a better (more $$) version at no extra cost. Matt has been awesome and super responsive. Couldn't have asked for a better experience or product.