The CTS-V is no joke. They are definitely very fast stock for how heavy they are.
https://www.youtube.com/watch?v=gdzb85WU_Ow#t=93
And thats just a sedan... The coupes run high 11's stock. With good tires and a nice launch I've seen a stock coupe run a consistent 11.3 in Ennis. 11 flat is probably a tune or something. The 11.3 is the fastest I've seen a coupe run stock. If you raced a sedan then it was definitely not stock lol.