Originally Posted by
shelbyfv
That's a Shimano freehub, as opposed to a Shimano compatible freehub. I don't think you are going to find that an 11 speed freehub will interchange. Though I've been wrong before.... I know the Ultegra 10 and 11 hubs are very different, even the freehub attachment bolt is a different size.
If you're so used to being wrong, why even risk it? Haha
The article describes the modification of a Shimano freehub, which is what the OP described, to accept a Sram 11-speed cassette.