The viper is not built to minimum class weight. I would not purchase a boat that is substantially overweight.

If you look closely at a viper you are in essence looking at a capricorn with two feet cut off. The beams, rudder stocks (not sure about the rudders) are straight off the capricorns.

The Viper is an over engineered boat, which I am sure makes the boat extremely rugged, but at the same time this causes the boat to be overweight. Although if you look at the last F16 - A cat invitational you can clearly see that boat weight has very little to do with performance. Robbie Daniels won the event on a Viper with CF mast. That being said, put Robbie Daniels on a piece of plywood with a bed sheet as a sail and he will beat everyone on the course.