The standard Sentra’s interior is not its strongest point, with lots of hard plastic and uncomfortable styling. The 2007 Nissan Sentra SE-R improves on it with a unique gauge package, black fabric, sport seats and other amenities like an optional 340-watt Rockford Fosgate stereo. But like the exterior, the improvements can’t do enough to overcome the interior’s basic shortcomings, such as a lack of nook-and-cranny storage space.