253 mph
Firstly type in the burger king cheat at the start screen
Then do the burger king challenge in the challenge series.
Once you have done this you will have unlocked the Junkman parts,
Which will be remembered from NFSU.
If you add these parts to a Lamborghini Murcielago that has been fully modified for max speed, the 253 mph can be reached in Drag race mode on what I think is the Camden and seaside drag race.
And of course 253 mph is faster than the fastest car in the world, the bugatti Veyron....
More tricks, tips and cheats for this game are right here - Need for Speed: Most Wanted cheats
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