Great cause. Given the momentum and history of charity auctions at places like Barrett-Jackson...what's the estimate !?!
I'll open with $400k
http://www.carscoops.com/2015/09/ford-is-auctioning-one-off-2016-shelby.html?m=1
Happened across this posting containing audio of both the EB and V8. I think the EB sounds alright.
I am partial to my BOSS 302 with both trackey and side pipe restrictors removed, but for a 4 cylinder it blows away how my old WRX sounded...