underdrive pulleys?

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thanks. why is this only good for 3-5 hp when other brands claim 10-12? are the other ones just a load of bs or is the 10-12 the power it makes at the flywheel or whatever and the 3-5 what you can expect from all of them at the wheels?
 
bigcat said:
rygen, wasnt there a dyno sheet posted (possibly from scriming)?

Yea, here is the dyno he posted on it from his site ( http://www.tammyandjohn.com/Mustang/Screaming/Mustang.htm )

pully_dyno.jpg