Replacing the stock radio

I am looking at a Mazda5 Grand Touring or a Scion XB. Has anyone replaced the stock radio in the Mazda5? Can the steering wheel radio controls be retained? I would like to get the stock Navigation but no dealer around here has one. A few Grand Touring models...but none with nav.
 
I am looking at a Mazda5 Grand Touring or a Scion XB. Has anyone replaced the stock radio in the Mazda5? Can the steering wheel radio controls be retained? I would like to get the stock Navigation but no dealer around here has one. A few Grand Touring models...but none with nav.

Get a nice Aftermarket Nav..for great saving.. (portable ones):rolleyes:
 
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