User blog comment:JustToothpick/Best Multiplayer Cars for Each Brackets/@comment-68.7.151.43-20170629034922/@comment-28856025-20170704031749

MP upgrade tunings I came up with:
 * 0300 1040 = A1417/1697 = 238 mph/383 km/h
 * 0402 3050 = A1460/1697 = 249 mph/400 km/h
 * 0502 5053 = A1522/1697 = 261 mph/421 km/h
 * 0505 5055 = A1599/1697 = 275 mph/442 km/h
 * 4525 5555 = A1667/1697 = 280 mph/450 km/h

Not very competitive, I would say.