The Nero Custom from the Import/Export update.
Vehicles.ide:
nero2, nero2, car, SUPERGT, SUPER, VEH@LOW, NULL, 50, 5, 0.3, 0.3, 0, 5, 1.0 ,0, sports

Use https://gtaforums.com/topic/955449-iv-zolikapatch/ to unlock the 4 livery limit