Is there any specific reason (business or street politics) why the coldest mouthpiece from Northern Cali (E-40), has never collaborated with the most successful producer from Southern Cali (Dr. Dre)????????? I personally feel Dr. Dre and E-40 should have collaborated long before 40 hooked up with Lil John. I just can't understand this, as a lifelong fan and supporter of West Coast Rap and Hip-Hop.