Peak power figures mean nothing, its what happens between 1000-7500 rpm thats important. This is why having the car mapped on a dyno always gives the best results, the tuner can see the power and torque curves and measure power at any given RPM and throttle position. Peak power is a measurement of power at 100% throttle for a very brief period of the RPM range, how often do people drive at full throttle at 7000rpm?