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Yes
A 2008 Jeep Liberty does not have a cabin filter.
The stock 08 wheels are 16s, if you use the 17 wheels from the Wrangler or other 17s
You should be able to if the lug-nut pattern is the same, given you have the clearance.
20" tires are the largest tires for your car if you of course don't have any lift kits..
Tie Rack
Yes you can
no
Generally, no.
31
Through the protruding air valve stem
Yes yes you can..