"9999999" Points:
At the "GENKI" logo screen, on controller 2, hold: [Start] + [L1] + [L2] + [R1] + [Down] Keep on holding until the title screen shows. When starting 1P game, you will start with 9999999 points!

Quick Lap:
On the starting line, turn sharp right and drive over the starting line. This will let you finish the round in 3 seconds.