$this->bbcode_second_pass_quote('greenworm', 'W')hat are the legal ramifications on building a better siphoning device solely for this purpose and advertising it as such?

You need to get an alpha dog and tie it to your car, the assailant probably sang along to your car alarm while he/she perpetrated the act.
I can hear it now.
"Eh, eh eh, beep, beep, beep, whooo, whooo, whooo." That should be enough gas, I am out of here.

I'm sure the advertising could feign some other sort of use. What is it that stores say bongs are really supposed to be used for again? Kind of a similar situation. I'm also thinking of those gadgets that prevent police radar from working on you when you're speeding....