Different Intro Sound (3DS Only)
Launch Mario Kart DS from the HOME menu. When both screens suddenly turn white, close the 3DS quickly and wait 5 seconds or as much as you desire. Then open the 3DS. Instead of a double-vroom sound, you'll hear a long fade vroom.
If you do not hear it in the attempt after 5 or more seconds, you might need to complete a GP Class or beat 150cc Mirror, or other classes.
More tricks, tips and cheats for this game are right here - Mario Kart DS cheats
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