Originally Posted by DeeezNuuuts83
You can't rule it out though. Mitsubishi/Ralliart exceeded that with the FQ-400 (405 hp), though I'm not sure if those count since I think they're sold as aftermarket kits, though they're still legit models. At the same time, AMG has been toying with turbochargers for quite some time at this point, like in the 65 series V-12s, the current 63 series V-8s (while also having been rumored to have been testing a twin-turbo version of the previous 63 series V-8) and also the more recent V-12 powering the current Pagani Huarya.
The new line up of 2012-2013 non AMG 550's also come twin turbo.