It's a little hard to say without knowing the size tire you are using. You can find that on the tire. Then you can call and get a quote on the size of tire for their cheapest to most expensive and decide what you want.
20" tires are the largest tires for your car if you of course don't have any lift kits..
Tie Rack
Yes you can
Generally, no.
Through the protruding air valve stem
Yes yes you can..
It was part of an option package
Yes, they will fit.
No. The factory rims are sixteen or seventeen inch.
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It means that your tires are flat.
235 75 16 fit and look big. no clearance problems.