Where do I buy a pulley or pulley set? Every Subaru/Import performance store sells pulleys. For purchasing, support your local economy or the NASIOC Vendors.

How hard is it to install a pulley or pulley set? Allow around one hour for install time. Professional installation, depending on your area, is around $75. This is one vehicle modification that is very simple and can be successfully accomplished by even the greenest shade tree mechanic.

How do I install a pulley or pulley set? Refer to the pulley manufacturer’s instructions. For pulleys without instructions, many rely on the Vishnu instructions for installation. Below are links to some of the better known pulley installation instructions:
Vishnu’s Instructions (contained inside the Stage Zero Instructions)
scoobymods.com instructions (with photos)
EDO Performance instructions (with photos)
Perrin Performance instructions (with photos)

Should I reset my ECU after this mod? It is never a bad idea to perform an ECU reset after a mod. The traditional route is to disconnect the negative battery terminal, press the brake pedal for a few seconds to bleed the system of charge, and reattach. Some use the more advanced Vishnu Reset.