Say you put on super light weight rims (save 10 lbs each) then there are 40 lbs unsprung weight reduced. This mean 40x4= 160 lbs sprung weight reduced. Your acceleration will be faster, which "adds" HP to the car.
"We feel that the power pulley is a bad way to get extra power from and engine and the potential for serious engine damage is too great.".............Steve Dinan