Peak HP is an absolutely useless number. The number that matters is peak Torque, which manufacturers rarely specify; and peak Torque is almost always at considerably less than peak HP.

bobby,
If you like the way the engine sounds, screaming along at RPM's way over what the engine was designed to run at, and you don't mind replacing your engines every 20 or 30 hours of running, keep using the 10 X 4.

(Would you drive a five speed car in 3rd gear at 70 mph because you liked to hear the engine scream?)
Dennis-