This is the Civic Si Sedan's ace in the hole. Love to drive but have kids? Here you go. Plenty of room, LATCH points all over the place for child seats, and even room for full-sized adults. Try that in the coupe. The seat cushions are a little on the short-and-low side, and taller passengers will wish for about a half-inch more vertical space to prevent a headliner hairdo, but beyond that it's a pretty good place to be. The kids will love it, especially if dad (or mom) indulges in the roller-coaster handling of the Si once in a while. In the safest way possible, of course.