Various Cheats:
Use the following driver names in the edit driver in build mode

FLYSKYHIGH - Rocket Car

NWHLS - No Wheels car

NCHSSS - No Chassis

FSTFRWRD - Fast Mode

MXPMX - Max Power Ups Always

RPCRNLY - Get grapple power ups only

PGLLGRN - Get turbo power ups only

PGLLYLL - Get mine power ups only

PGLLRD - Get shooter power ups only

LNFRRRM - Get reversed rocket racer run track

NSLWJ - Keep speed while off track

NDRVR - No driver

NMRCHTS - Clear all cheats

Extra boost at the start line

As it says 3 2 1 go press accelerate just after 1 and just before GO to get an extra boost.