Proposition here not necesary but it might be something to think about as we are currently near 200mods. I think it will go over 1000 next year so we need more filter and way to display them.
These are my ideas, can be taken separately, discarded or improved...
More columns would be a great start. It can also be on the website and not ingame and vice versa.
The filters could be be the number of wheels. 2,3,4 currently
For 4 wheelers RWD, FWD AWD
Engine size displacement, power, torque (could be a bracket min max), n cylinder, fuel type/electric, power ratio.
Open wheelers/closed cockpit.
Racing categories/vehicules categories (that might be various for some cars): drift, track, rallycross, rallye, kart, open wheelers, 4x4, late model/vintage, law inforcement (or vehicules with flashing lights in general (cops, ambulances, safety cars), exotic supercars, fun, heavy or utilities, buses, dragsters...
Rating bracket.
Date modified bracket.
Date first release bracket.
LFS cars could also host some families, like a LX derivative is LX family. XF, XR...
Also the filter might also appear on server list like mods: all or p166t or drift or whatever.