Any updates on this subject? My car has the 2 blank rubber ends facing each other without the hose in between. It wouldn't be much effort to punch some holes and try it. Who else has retrofitted their car this way?

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1985 380SE Blue/Blue - 230,000 miles
2012 Subaru Forester 5-speed
2005 Toyota Sienna
2004 Chrysler Sebring convertible
1999 Toyota Tacoma