My Bezza is 2017 pre-Improvement model. If you are referring to the rear lower diffuser then yes you can get it done at SC. Cost around RM200++..

Mods done so far,
- Rear diffuser, RM200++
- Chrome aircon knob, RM28++ each.
- Gear console trim, RM40++
- Advance Steering, RM470++

Contemplating changing doors handle cover but now already have scratches so the silver painted ones don't know will suffer the same??.

Not sure if its suppose to function as a diffuser(drag coefficient affected slightly)  but more to address the "Tonggek" complaints.