Unlock the GT40 Concept car from the Season 1 Official Races. You can buy it for $150,000 then sell it for $185,000 to $195,000. It only takes about one or two game days to sell it, for a $35,000 to $45,000 profit.

Go to offical race and when you get to license test, type A-B-Y-A-A-X-RIGHT TR.

Buy a part for your car, and make sure that you have exactly the right amount of money as your total amount. You will then get the part for free.

Go to garage and hold in l and r then press y, b, b, a, a, white, black.

Go to the garage, hold right trigger, then press Y, B, black, white A.

Go to the car shop and click dodge, then go to the viper, hold [L] trigger and [R] trigger, then push [A] and you will get it.

Hold R trigger and press x, y, L trigger and start at the main menu

When you're in the garage press white, left, right, white, left and you will get a 1967 Ford Dragester.

Go to the used parts section regularly and check for question marks. For $1800 you can get a bottle of Nitrous Oxide, only for use in Drag Racing. To use it, press Y. Use wisely, as it is one-time only.

Note: This was done with a play time of 24 hours.
To obtain nitrous for the drag race you must be on a day ending in a 6 (26, 86, 236, etc). You must first lose a drag race at least one day before the day ending in a "6", or up to 3 days in advance (ends in "3").

Once you have lost, and it is a day ending in a "6", go to the used parts shop and the part will be all the way to the right under the "???". The part costs $1980 and you can only use it once (by pressing Y button) in a drag race.

Get a six gear car. Top it out with the maximum HP, ten test it out in the Sega Drag race. Make sure you get your car in a Manual Transmission. Start out with sixth gear, and accelerate just before the last second. When you go up to 40 mph, shift down to third and make your way up the gears.

Clear the second season then race the hatchback event. If you raced the hatchback event before doing so, you may not perform this trick correctly.

After you clear the second season buy a Civic Type R 02 and fully modify the car. Race the hatchback event and come in first.