Debug Mode
Start the game using the command line parameter /debug. 

Example:
"C:\Drift\drift.exe /debug" to start the game with.

/DEBUG - Enable Special Debug Menu Where You Can Select Start
Mission / Money / Ships / Etc. 


Money Hexcheats
Use a hex editor to open the saved game file. 
Go to HEX address 71 through 73 and change the values to FF. 
You should see FF FF FF when done correctly. 
Now save the file and reload the saved game. 
You should have 16 million bucks!