3 New Cars
On the car selection screen, hold the Top, Bottom, and Left C buttons. While you’re holding these buttons, scroll through the 4 cars. Three of them will be replaced with a school bus, an ATV and a police car.
(Thanks to Yillun)

Flashing Lights
Complete a course with a top 10 time on it. When your intials are entered, press Down until you see the conveyor, then press Left. Hold Left until you see a head go by saying, ”I love this job.” Select the Police Car or the School Bus and press BRAKE, BRAKE, GAS while in the race to activate the flashing lights on it.
(Thanks to Yillun)

Secret Stages
At the Choose Race screen, hold the following for hidden courses:
Golden Gate Park - L Button + Left C + Down C.
Indiana - L Button + Up C + Right C.
San Francisco - L Button + Right C + Down C.
(Thanks to Yillun)

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