Unlockables:

Super Excite Mode	Get an S rank on all races in Excite mode
Mirror Mode	        Get an S rank on all races in Super Excite mode
Special Race Icons	Get an S rank on all races in Super Challenge Mode
Alternate Paint Job	Place 1st on 10 races with a single truck
Alternate Paint Job	Get an S rank on three races with a single truck.
Monster Truck	        Unlock Alternate Paint Jobs for all 19 trucks
Silver Cup	        Complete Bronze Cup
Gold Cup	        Complete Silver Cup
Platinum Cup	        Complete Gold Cup
Diamond Cup	        In Super Excite Mode, beat all races in the Bronze, 
                        Silver, Gold and Platinum Cups.