$13K ?? I would have guess it would cost more. A lot more.
And no.... I like 4 wheels and lots of steel around me when I'm going fast.
When I purchased my first new car, a 1977 Z28 Camaro, the sales guy asked me; 'Do you wanted a T tops added to the car?' I told hem... "No, when I roll the car over I want steel above my head." That's when I started wearing a seat belt too. I knew I could get into trouble. I also found being held into the seat meant, I could go around comers faster too. (that's when seatbelts would cinch down and stay tight)