"And for all this, the new 5.0-liter V8 weighs only 10 pounds more than the outgoing 4.6-liter version. And weight, or the relative lack of it, is what has been keeping the Mustang GT in the hunt with the thundering Camaro, despite the relatively weak output of the 4.6-liter V8." http://www.insideline.com/ford/mustang/2011/2011-ford-mustang-gt-5-0-first-look.html