driveshafts

http://lanesplitter.jalopnik.com/motorcycle-sprocket-impales-drivers-windshield-1703356397/+nicoleconlan

I am wondering, who makes custom shafts? I have heard that if they are too strong, you blow up some important pieces. I would be interested in 1.5-2" of increased wb, with a proper shaft, that would break when needed. Anyone have any leads on this?