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Dreamcast - Metropolitan Highway Battle cheats

Extra Parts:
Bonus parts in Mufflers and Aero option:
complete Quest mode once.

Unlock the Old Datsun:
Win 200 quick races consecutively 

Unlock the Car Type 930:
Defeat The four Devos team, all the other cars, 
and the four Devils.

Unlock the Honda S2000:
Defeat The Four Devos team.

Unlock the Porsche 911:
First unlock the Honda S2000, then defeat the other death cars.

Maximum speed in quest mode:
Go to the "Assist Shifting" options, then press Y.

Enable rival pointers in quest mode:
G ot the "Assist Shifting" options, then press R or L. 

Change replay view:
Hold L + R and press A at the post-race screen.
Pick the "Replay" option to see rear view.