The save has beaten all three starting crews (TFK, 21st Street, and Los Colibres) and defeated Darius in the final canyon duel. But more importantly, it has done so with (e.g., winning specific races with a 3-star rating).
While the mod is phenomenal, it resets your save progress. You start from a beat-up Toyota MR2 with zero cash. The grind is real. nfs carbon redux save game extra quality