He first released a demo tape titled "Underground King" which didn't feature Bun B on the track.

Queen and Jackson later left the group leaving Pimp C and Bun B so they decided to revert to UGK.

[8] When Bun B's UGK partner, the late Chad "Pimp C" Butler, entered a jail sentence on an aggravated gun assault charge in 2002, Bun B made guest appearances on numerous albums by other rappers and released a 2005 mixtape titled Legends.

[9] Singles featuring a Bun B guest appearance included "They Don't Know" by Paul Wall, "Gimme That" by Webbie and "I'm A G" by Yung Joc.

In an interview with MTV Live, Bun B stated that 2Pac was set to feature on the album, claiming "It's a brand new verse.

On March 3, 2012, Bun B leaked a song featuring Royce da 5'9" and Redman titled "Stop Playin'" after he reached 400,000 followers on Twitter.

[18] On August 22, 2013, Rap-A-Lot Records revealed that his Sony distributed fourth studio album will be released in October 2013.

It was also confirmed to feature Pimp C, 2 Chainz, Rick Ross, Lil Boosie, Kirko Bangz, Big K.R.I.T., Raekwon, Z-Ro and Devin The Dude.

[22] On June 24, 2014, Bun B made a guest appearance to the Htown Beatdown concert hosted by local radio station Hot 95.7.

At the start of the Spring 2011 semester, Bun B joined the faculty of Rice University as a Distinguished Lecturer.

[25] Bun B opened up Trill Burgers located on South Shepherd and Richmond Avenue in Houston, Texas.

[27] His stepson is American rapper Young-B, who is a member of the rap group Youngest N Charge, which is Bun B's opening act.