Mario Kart 64/Audio Differences

Several sound effects were changed from the Japanese version in the international releases.

Title Screen

 * The title screen voice says "Welcome to Mario Kart" in both the US and PAL versions. In the Japanese version, it's a bunch of Japanese kids shouting "Mario Kart!", while in the American version you get to hear the titular person of this game, Mario.

Narrator

 * In the international versions, the menus are narrated by Mario himself. In the Japanese versions, it's some generic narrator with a really inconsistent accent.

Voice Clips

 * Wario, Toad, Luigi and Peach's voice in the Japanese version are the ones used in Mario Party.

Toad
They didn't fit quite well here, so they were changed to new ones in the American version. This also affects the laugh of the Thwomps in Bowser's Castle, as they are really just Wario's laugh slowed down.

Misc. Differences

 * The sound effect that plays when you get a turbo start is absent in the Japanese version.