ZetecRacing got 2hp and 8lbs of torque w/ his Esslinger pulley. I have the ASP pulley and like it alot, car feels less sluggish through the gears. The intalation isn't really that hard.
What you'll need:
Jackstands for the front.
Socket set and ratchet
Phillips head screwdriver
Some WD40 or "breakfree" lubicant
A friend to hold the brakes for you.
Buy a haines manual and it will layout the whole process for you. Really straight forward 2hour job.