Yo, Gab!
Me again.
I'm not sure about an aftermarket Turbo Kit. One thing for sure; You can buy a used (good shape) Turbo Set-up to convert you Sled into a TNT (Turbo from a Non Turbo) for way cheaper that you can buy a somewhat "unproven" Turbo Set-up.
Just do a search and you'll find lots of info about it.
Later.
Ghislain.