BG Knocc Out & Dresta- Back In The Day
That beat is from Lil Half Deads Album "Steel on a Mission". Any1 who likes G Funk should get it. One of the best Albums in my opinion.
Some more songs from that Album
Lil 1/2 Dead - Still Rollin
Lil Half Dead - Steel On A Mission
Lil' 1/2 Dead - Cavvy Sounds