I have the option of going Uber X or Uber XL only. I have been driving for 1 year and have had that option for that long. It is nothing you can sign up for, Uber assigns it to you if you qualify. Does you vehicle legally seat 6 plus you? If so then email Uber and let them know. I have a van and It qualifies for XL. If you can not seat 6 pax then it does not matter what size engine you have, your just an Uber X.