The Adolescents toured in support of "OC Confidential", but Frank Agnew left the band in 2006. Rotating through as the band's live guitarists over the next few years were Matt Beld, Joe Harrison, and Soto's former Joyride bandmate Mike McKnight. O'Brien left the band in 2008 and was replaced by Armando Del Rio. Reflex and Soto became the band's sole constant members and primary songwriters from this point forward, and signed the Adolescents to German label Concrete Jungle Records. A split EP with the band Burning Heads was released in 2009. For the band's next album, 2011's "The Fastest Kid Alive", the lineup was Reflex, Soto, Del Rio, McKnight, and Harrison. The band also contributed a cover version of the Runaways' "School Days" to the tribute album "Take It or Leave It: A Tribute to the Queens of Noise" that year.