I went to Team Inferno Setup Field and downloaded that setup package thing.
So, does anyone have any idea where I'm supposed to put them? Where abouts in the "data" folder? Thanks in advance.

All setups needs to be placed in LFS\data\settings and named like this:
CAR_whatever you would like to call it.set
For example:
XR GT TURBO_Bosse drift.set

Fank yew very much kind sir.