Personally, I would stretch the 911 a little bit(not much!) to allow more leg room for the rear passengers. If drivers need something smaller, there is the Cayman. 



        I wouldnt need the legroom for kids but my golfbag would like it Smiley

Also, I think a streched version would make the car a bit more quiet on High Speeds. Just not sure what the corner handling would do? Smiley