There is a "machine gun" kit for nitrous purges.. my plan had been to hook a purge up with a split tube 1 to each side and have a blue LED back lighting it, use the flash to pass trigger to shoot em off. Zex has a kit for $100 and then you just need to get a small bottle. Id probably fill it with CO2 or something though so its cheaper...
Here is the kit in action:
http://www.zex.com/Base/MultiMedia/P..._RapidFire.wmv
I might still do this before next year but.. just a warning in case anyone tries. The main concern is figuring out a way to be able to use the kit while moving and not having to worry about unmetered nitrous blowing into the air box

Would probably have to disconnect the intake tubes and angle the real intake elsewhere. Or only use it when not moving.
-Lou