I installed Prodrive springs on my 2003 WRX wagon. In the process of using some of the posted instructions, I screwed up one of my struts and so I bought some new ones and installed those too. To help others avoid the $130 mistake I made, here is a detailed install guide.
Disclaimer: If anything goes wrong it's not my fault. Blindly follow these instructions at your own risk.
2003 WRX Wagon
What is installed:
KYB GR-2 struts: GC fronts, GD rears
I'm going to start with the front end:
1. Jack up car. Obviously, apply parking brake, put car in gear, chock the wheels, etc...
2. Secure the car on jackstands. It's easier if the entire front or back is up, i.e. both front wheels off the ground at the same time.
3. Remove wheels and open hood.