This is really easy and requires no hacking devices.

Step 1: Go to "customize vehicle" in the garage.
Step 2: Go to "exterior/interior".
Step 3: Go to WHAT TYPE of part you want NOT THE PART. A type of part would be:
Spoilers,widebodies, headlights(this works with any of them I didn't want to name them all."
Step 3: Do not click and find the part you want. If you want a spoiler HOVER OVER spoiler (so it's highlighted) and press X.
Step 4: hover over the part you want( make it so spoiler 2 of 4 is hilighted)
Step 5: press the XBOX logo in the middle of your controller and join an xbox live match. You can join from recent players or friends list.


(If you want this to be easier go play an Xbox Live match and then do this step so you have a match to join.)

This used to work with Performance upgrades but not anymore. So use this before it's patched.

First find a map with the locations for the barrels. You can find them on google just type " midnight club LA barrels map" ( without the quotes ). Now you should have the map. This works better if you have the game's original map that way all you have to do is copied the barrels location ... If you don't just print one ... Now that you have he map go to the game play ... When you start the game you should be at your garage .... Pause the game and go to the RACE EDITOR .... In the race editor you can transport all around the city (cities) all you have to do is press BACK on you control and than select the place you want to go to press BACK time and you should transport to the place selected ... Now all you have to do is match the location on your map or the map printed to the map on the screen and you should find about 51 barrels the other are a little harder to get so you're on your own ... But the 51 barrels should give you infinitive nitrous, infinitive special abilities, no damage to your car, no cops, and the a new view for your car .... Now all is left to do is play and finished the game ... Oh and one more thing YOU'RE WELCOME !!!!!!!!!!!