I had to burn some time here so I thought I'd make a guide for the subaru wave. In true military style even the simplest things are documented in detail. Enjoy!
SOFI 12.3-2 Subaru Owners Field Instruction
Section A - History of the wave
Proper waving is an integral part of customs and courtesies. The history of the subaru wave dates back to the middle-century when 360 owners would nod as a sign of recognition. With the mass production introduction of the WRX in 2001 and Sti in 2003 it has become a common courtesy to wave to another Subaru owner as a sign of mutual respect.
Section B - How to wave
There are various techniques of waving. They all however involve the usage of the hand. The most visually effective meathod of the wave while in the Continental US (Use the left hand if waving from a Non-US right sided vehicle) is to raise your right hand 20 degrees off the steering wheel and spread the tips of your fingers one inch apart. It is very important that you spread your fingers apart so as not to resemble the "heil hitler" salute. You also want to make sure you do not wave your hand from side to side - that denotes you have spotted a friend versus the Subaru wave.
Section C - When to wave
This is to be done when the other subaru is spotted within 8 car lengths in front of you or earlier depending on speed. This ensures the other driver has ample time to recognise the wave and return it. You are to hold the wave intil the wave is returned or the car has gone past. You then place your hand directly onto the steering wheel at a 45 degree angle.
Section D - Who to wave
You are required to wave at any impreza owner. Superior imprezas also require a slight downward head nod in addition to the wave. Although non-impreza owners are not aware of the subaru wave-salute (especially outback owners) you have the option to wave them at your own risk of being ignored.
Section E - Incorrect Signaling
The subaru wave is meant as a courtesy and respect under normal conditions of passing traffic who happen to have made the same wise investment you've made. You should not attempt to signal the other owner by:
Swirving your car back and forth to display the recognizable excellent handling
Waving with both hands
Shining your brights
Flashing hazard signals
Honking your horn
Attempting to yell out the window
Smiling a great big smile
Or lifting your chin up and whispering to yourself "sup"
You should not salute at night, whilst make a hard turn nor should you attempt to wave during an Auto-x event.
Preserve the wave and use it wisely. This is one of the things that distinguishes us from the rest of the punks. Besides having really large manhood and a love for the outdoors.
Revision 4.1 09JAN2006 Department of Awareness