-Make a fast car and race the McLaren F1 for 68,157 credits. That is the maximum amount you can race any car for.
-Get a McLaren F1 668 HP and make it as fast as you can, then race lots of pink slips against the McLaren F1. You will get plenty of McLaren F1s. Sell all the McLaren F1s except the McLaren F1 you want. Each is worth 340,289 credits.
-Purchase a Mercedes Sl55 AMG and put in all SVA tuning for parts. Race a McLaren F1 for 677,777 credits. During the race, use the nitrous down the entire track to win.