I just stumbled upon a review by someone that had both. You can find it on the other forums.
"2) The exhaust is what I’m all about! It’s hard to beat that V10 Corsa mode in the Lambo. It’s high pitch and at 6000+ RPM you can likely blow the roof off a house. The reality of the matter is that the Z06 isn’t as loud but it sounds better. The Z06 has more of that deep growl to it and you can hear the growl even at low RPMs of 2-3K (in Z mode). Everyone has their personal opinion but even though the Z06 exhaust isn’t as loud it definitely sounds better!"
Car is loud enough are my thoughts. My neighbors have already paid me a visit about cold starts. I tried starting the car just before opening the door and it sets the car alarm of another vehicle parked 3 spots away in my garage. Just can't win......