When you have a Mushroom Turbo boost Power up and you are about to go on a Spring Ramp, Use you're Turbo Boost power up, If you use it JUST BEFORE you go on the ramp/spring You can go much further and faster.
This works on just about every course with a spring/boost on it, but I don't think it is very effective on massive red and yellow ramps...
Once you have an Item and it is scrolling to decide which one you get press ''L'' a few times and the scrolling will stop so you get the Item twice as fast!
On the Player Select screen, press L to make the rotating image of the character you put the cursor on shoot a green shell straight ahead. You can also press R to make that character jump. Do this as many times as you please, it's just a little trick to try if you want.
As in Mario Kart 64, you are able to power slide in this game as well! To perform a power slide, press and hold R to hop while holding Left or Right. When you land, you'll slide in the direction you were holding. After about 2 seconds, let go of the R button and stop sliding. When you drive straight, you'll be given a boost, which is the result of a power slide. It may take a little bit of practice to pull it off, but it helps when trying to get around hairpin turns, or if you want to cut a couple seconds off your time when racing in Time Trial mode.
When you run straight into a Banana or another hazard, you'll notice your kart goes off balance before spinning out totally. To get back on balance before spinning out, release the acceleration and press the brakes (you must do this before you actually spin out, or else it'll be worthless). If you did it correctly, you'll see a music note appear above your character's head, showing you pulled it off successfully.