^thats a remix Tech did, him & Pac never made a song (tight Remix tough).
Assassin ft. 2Pac - Real Bad Boyz
Dee Tha Mad Bitch ft. 2Pac - Real Bad Boyz (OG) [produced by Assassin]
K. Murray, Biggie & 2Pac - Fuck Whatcha Heard [this is the verse that was used in the Big L song]