Hey darth! Great map, lots of fun. Just, you know, add a gravity volume at the entrance to the "flush" such that people will stick into the track. Other than that, great work! Perhaps adding aesthetics in the centre like a tower or something like that would be cool.
Oh, and maybe rocket hogs will make it way more chaotic... Because you know, it would get boring. Make it such that you are invulnerable and you fire rockets like madmen at others. Ever get tired of rocket race in reach? Yeah, me neither.