Getting Kart Bodies Easily
Use the following trick to easily obtain a Kart body that you have not previously unlocked. Download another player's Kart that uses the desired body design. You can then edit their Kart and save it for your own use.
Helping With Boosts
If you press the Playstation (PS) button while the announcers are counting the race off the game will pause right when you can press the L1 button to get a boost start. This is helpful because you can have a boost start at the beginning of all career mode.
Choose to edit your car. Choose any sticker and move it around. Use the right Analog Stick and look down at the car. Rotate the camera until you see the sticker on the overhead light.
Hidden United Front Sticker
Go to Car Create and choose to put on a sticker. Zoom out all the way and move around till you see the United Front sticker on the right.
Want to create a Kart but don't have the Kart body you want yet? Just download someone else Kart that uses that body. If they didn't lock it, you can edit their creation and then save it.
To get a turbo start at the beginning of a race, wait for the announcer to count down "3... 2... 1...", then wait for him to say "GO!". As soon as he, tap L1 (Boost) to speed off the starting line.
If another racers uses a warp portal, you can go through the open portal and warp together with the racer that used it.