Miles Cook
January 2, 2007

On the Dyno
If you only look at the peak horsepower gain, shown in bold numbers, then sure, the headers only gained 4 hp at the wheels. But you'd be missing the large majority of what the headers really did for our '06 Mustang GT test car.

Study the dyno charts to discern the real benefits of the BBK headers: improvements in torque output. For example, look at the results at 3,000 rpm. The car in the baseline test made 265.6 lb-ft. With the headers, the figure jumped to 283.2, an improvement of 17.6 lb-ft.

Torque is what you feel on the street, and having more of it in the midrange is what's important for slipping through traffic and getting up freeway on-ramps. At various speeds, power output isn't too bad either. Again looking at 3,000 rpm, the baseline test result is 151.7 hp. With the headers in place, output jumped to 161.8 hp for a gain of more than 10 hp.

Additionally, recall that we're only testing the headers here. With BBK's crossover pipe in place, figure another 10 hp or so improvement across the board or well over 300 hp at the wheels on this car already equipped with a BBK throttle body and cold-air kit. Note too that the power and torque peaks with the headers were at slightly lower engine speeds, which makes the power all the more usable on the street. Furthermore, with the headers, the torque curve stayed over 300 lb-ft from 3,750 all the way to 5,000 rpm, another notable improvement over the baseline test.

Baseline: '06 Mustang GT with
BBK throttle body and cold-air kit
 
RPM POWER TORQUE
2,250 114.0 266.2
2,500 127.3 267.5
2,750 139.3 266.1
3,000 151.7 265.6
3,250 166.0 268.2
3,500 188.1 282.2
3,750 207.7 290.9
4,000 229.9 301.9
4,250 246.5 304.7
4,500 261.4 305.1
4,750 271.2 299.8
5,000 284.2 298.5
5,250 292.2 292.3
5,500 292.4 279.2
5,750 292.0 266.7
6,000 291.0 254.8
BBK headers
RPM POWER TORQUE
2,250 118.3 276.0
2,500 131.9 277.0
2,750 148.0 282.8
3,000 161.8 283.2
3,250 175.5 283.6
3,500 197.9 296.9
3,750 214.7 300.7
4,000 236.0 309.8
4,250 255.6 315.8
4,500 270.0 315.1
4,750 279.9 309.5
5,000 291.9 306.6
5,250 296.4 296.5
5,500 286.2 273.3
5,750 286.8 262.0
6,000 286.9 251.1