I'm pretty sure you're not really sure what you're talking about. If your car is a manual you have a viscus coupling. Every manual 5 speed has it. Automatics have transfer clutches. No you can't do what you're saying. An open diff doesn't mean there isn't a viscus transfering power to the rear. An open diff just meands there isn't an LSD in the front diff.
Viscous Centre Diff To Open Centre Diff
in Fourth Generation Legacy (2005 - 2009)
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