[retro500]

2011 Mustang 5.0

3rd gear (1.69:1)
Horsepower: 365.26 hp @ 6600 rpm
Torque: 335.27 lb ft @ 4500 rpm

4th gear (1.32:1)
Horsepower: 377.99 hp @ 6500 rpm
Torque: 351.44 lb-ft @ 4400 rpm

2011 Mustang V-6

3rd gear (1.67:1)
Horsepower: 268.06 hp @ 6700 rpm
Torque: 249.95 lb-ft @ 4000 rpm

4th gear (1.24:1)
Horsepower: 267.11 hp @ 5800 rpm
Torque: 259.90 lb-ft @ 4100 rpm

Now here is where it gets interesting. Those numbers are what the V-8 and V-6 Mustangs are putting down at the rear wheels, without factoring in anywhere from 10-25 percent of output lost to friction. Motor Trend's tech department recommendation is a bit more conservative 15 percent.* After examining the power peaks, K&N's techs suggested we use the fourth gear pulls for the 5.0-liter and third gear pulls for 3.7-liter.* With that we arrive at what we think are the most correct output figures for the 2011 Mustangs:

2011 Mustang 5.0 (4th gear pull, 15% powertrain loss)
Claimed horsepower: 412 hp @ 6500 rpm
Claimed torque: 390 lb-ft @ 4250 rpm
Actual horsepower: 435 hp 6500 rpm
Actual torque: 404 lb-ft @ 4400 rpm

2011 Mustang V-6 (3rd gear pull, 15% powertrain loss)
Claimed horsepower: 305 hp @ 6500 rpm
Claimed torque: 280 lb-ft @ 4250 rpm
Actual horsepower: 308 hp @ 6700 rpm
Actual torque: 287 lb-ft @