Thanks for all the info. I didn't realize that AFM was such a troublemaker

It's ok, I will still take it over my V6

I don't know why Corsa quoted me such high prices...I found several place online with free shipping for about $1200. Still a lot compared to other systems, but it really was drone-free on my V6, and supposedly it doesn't sound bad when AFM switches on & off. I might just have to bite the bullet and do it eventually.
Is the Corsa
really loud? It sounds pretty loud in the youtube clips. On the V6, it was a little louder than stock at idle, and there was a nice rumble when cruising, but not at all intrusive. When I got on the gas, the thing really screamed. Basically, it was a loud-when-you-want-it-to-be system. Is it the same deal on the V8?