Ford will be upgrading their current 3.5 liter V6 engine in their Ford Mustang to a 3.7 liter V7 that will be pumping otu 273 horsepower for the 2011 Ford Mustang. This news isn't totally fact yet, but the sources are good, they came from Autoblog.com. This must be the first time the Mustang ever had an V7 in it, definitely kind of weird. I wonder how the exhaust will sound, might totally change it. Definitely sound more agressive than a V6 that's for sure.