I'll chime in on this one. I recently purchased a 2011 V6 Auto w/pony package and 2.73 gears. While I have yet to take it to the track it pulls as hard or harder than my 07' Impala SS 5.3L with 303HP. My Impala ran 13.9 and my new stang feels every bit as fast with my butt dyno!
2011 Mustang V6 Pony Package Kona Blue, Airaid CAI, MRT Interceptor Axle-back exhaust, Automatic, Tunes 93 Octane Race Tune, Baltimore Street Mods 10" Racing Stripes, 2010 Mustang GT Ford Racing Strut Tower Brace, J&M Extreme Joint Rear Lower Control Arms, Ford Motorsport 3.73 Gears, Shaftmasters Aluminum Driveshaft, JLT Oil Separator