Can people list a few below?
I don't know what you mean by 'Dubstep rap', but some good Dubstep music would be Bonfire (http://www.youtube.com/watch?v=e-IWRmpefzE (http://www.youtube.com/watch?v=e-IWRmpefzE)) and Power Glove (http://www.youtube.com/watch?v=y_z9W_N5Drg (http://www.youtube.com/watch?v=y_z9W_N5Drg)) by Knife Party. There are few (and far between) lyrics in them, but they seem sorta like the kind of thing you're looking for, I guess. :confused:
i know theres a few out there, but first one that comes to mind for me is
https://soundcloud.com/medic-the-spacecat/time-is-short-ft-tmp
Thanks :)