This trainer has been made for Need for Speed Hot Pursuit 2010 (NFS 11).
It should support most game versions, tested with v1.0

Yeah this game was released months ago and back then, all I have done is a cheat table with a nitro option and some instruction on how to change the weight of the car. As it was requested, I have made more cheats and here is a trainer for changing the weight of the car and fly like a crazy bat.

UPDATE (1st April, 2011):
I have made a super boost cheat. To use it, download this cheat table and use it with Cheat Engine 6.0 or higher:
Need for Speed Hot Pursuit +4 Cheat Engine table
Need for Speed Hot Pursuit +4 trainer (with beta CE version)

NOTES for the RPM boost cheat:
If you have enabled this cheat, you can activate the RPM boost by holding down the Left CTRL key. You need to use this cheat along with the nitro. If you use it without nitro, your car will spin off track so

1. Activate nitro.
2. Use RPM boost.

I also recommend to enable all other cheats, especially Unlimited Nitro and Lightweight car.
This cheat was also made in an attempt to support more versions just like the others, but it is very complex so it may not work with so many versions as the other cheats. I have tested it with v1.0.

What will this boost give you? It will boost your speed way above the top speed of the car, even as far as 850 km/h. The top speed is changing car by car. (See it on the video below.)

Trainer download link:
Need for Speed Hot Pursuit +3 trainer (this trainer doesn't have the RPM boost cheat)

First run the trainer.
Then run the game. (You can start the game with it's own icon or You can use the Start game button in the trainer.)
Hit number keys on the numerical keyboard to turn options on/off. Make sure that NumLock is active.
You can also use the checkboxes to enable/disable the options.

There are 3 options in this trainer:

1. Nitro
2. Unlimited Health
3. Lightweight car

NOTES:

All options are working for the human player only, they don't affect the computer players.

Nitro: This will charge Your nitro faster.

Unlimited Health: This will give unlimited health.

Lightweight car: This will change Your car's weight to have better acceleration and brake. It will also turn much
better which means You need to be a bit more careful but You can take much harder turns. If You turn off the option,
Your car's weight will remain the same until the car is re-spawned (for example when You hit something).

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Some information about virus reports for trainers generally. Read it before You post something about some virus.
http://szemelyesintegracio.hu/cheats/41-game-hacking-articles/212-trainers-and-anti-vir-softwares