Groove or Afterburner maybe could work. And then that third party IDW Rodimus as Galvatron... Sorry @Skull001 for the minor thread hijacking
I love Breakdown so I'm excited to see this mold done as him. I really wish they made it an official redeco tbh.
Update: Alt-mode finished, I opted to paint the spoiler: Original vs Custom: With his fellow stunticons in alt-mode: