More practical would be a rubber hose or the likes.
Like a DEF or urea exhaust system... in a way. Even if you don't run Diesel.
Nobody would notice you using it unless right on your tail. And then, ah well.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gmeter or 0.13 Mmile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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