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Just one question - where did you put the bottle in a bubble-back C3? Technically the car won't be street legal, even if it's turned off, so I'd like to put the bottle somewhere where it can't be seen. Is there room under the rear storage compartment? If so, is that a safe place to put it?
One suggestion was to go with a small bottle that's the size of a fire extinguisher, paint it red, and then peel the label off of a real real one and put it on the nitrous bottle so if I'm ever stopped it would just look like I had a fire extinguisher mounted back there.
From: Graceland in a Not Correctly Restored Stingray
The fake speaker box may be easier. Plus, I suggest that you carry a real extinguisher, anyway. I've never had to use one on my own car, but have saved the day for someone else with it.