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this glitch is similar to the other ones on here exept it works on any car and any part. when you start the game and it asks you to download the upgrade, DO NOT UPGRADE!!!!!!!!!! it will not let you use the glitch.to do this glitch, get in any car and go to buy upgrades. go to any part that has more than one upgrade. buy the first one, and highlite it then press (RT)+(X). when it asks if you want to sell it, press a, and you will get the credits but keep the upgrade. you can do this as many times as you want
*UPDATE*
Hey guys to delete your updates. You should take out anything connecting your xbox to the internet. Then go to the system blade then memo...