SR20 + Legal Issues

Okay, I find this a valid statement, but to save my butt when I do eventually do something stupid (sorry if this goes a bit off-topic from the original SR20 topic), but what if I were to install a ‘dummy’ nitrous system? Specifically one intended to be used as a gag trick and for basic shits and giggles. Any harm in doing that?

Here is the specific ‘dummy’ nitrous bottle in question:
http://i210.photobucket.com/albums/bb177/REDisFASTER/BYONOS.jpg
http://i210.photobucket.com/albums/bb177/REDisFASTER/BYONOS2.jpg