The phrase "extra chrome" refers to something that is more flashy or decorative than necessary. It means adding unnecessary or excessive embellishments to an object or situation. Full definition
An update in the summer of 2016 added extra chrome and glossy materials for the air vents and dashboard. (carbuyer.co.uk)
Beautiful, black with a lot of extra chrome, leather interior. (kbb.com)
You can select Urban or Rugged styling packs, which feature attractive additions such as extra chrome trim, a tailgate spoiler or tougher skid plates. (autoexpress.co.uk)