HP is a measure of work/time. You can create torque without any work actually being done is what ben is saying. Getting work done as fast as possible is what makes the car go fast. Therefore, HP is all that matters. If you want I can take you for a ride in a Peterbuilt truck and you can see for yourself. 1500lbft makes the rig feel fast! But look at the speedo and you realize that only 500hp makes the rig slow. The reason why the rig can do so much work is because of the HP at low RPM and torque multiplication by the 13 speed gearbox. By multiplying the "torque" it makes it easier to get the work done, but not faster.