Big Boi, the half of Outkast that still hits the road to play for fans, popped by the Sinclair Wednesday as part of the Converse Rubber Tracks series and promptly ran through all the hits that made the Atlanta rap duo a monster of hip-hop and pop. Even without Andre 3000, who’s busy with his burgeoning acting career, songs like “B.O.B.” and “Atliens” sent an electric current through the crowd that packed the venue for the free show. Yes, the absence of Andre 3000’s high-pitched “Forever? Forever-ever?” on the song “Ms. Jackson” was noticeable, but with Organized Noize crooner Sleepy Brown by Big Boi’s side, two-step grooves like “So Fresh, So Clean” and “The Way You Move” had the same charm. It took the crowd time to warm up to some of the cuts Big Boi has crafted in the nine years since Outkast went on hiatus, but Big made sure the 90-minute jam session never slowed down.