For me I only know two guys that were producers first and then they made it to the rap game as hip hop heavyweights and only these two come to mind Kanye West and Dr. Dre. So out of these two who is the best producer turned rapper?

kanye, when is his nxt cd comin out

i think timbaland should start rappin
and
will.i.am should go solo

Dr. Dre

kanye west.

Dr.DRE, period.

I would vote for Dre, except the fact that all his stuff is ghostwritten by someone else.

so Kanye wins by default.

of course kanye West

Kanye!!