Purchase any part/upgrade for any car and have the exact amount of money in your total money. You will receive the part/upgrade for free. For example, have $10,000 total money and purchase a Tuned ROM upgrade priced at $10,000. You will get the part for free with $10,000 still in your total money.
Control replay views:
You can control the camera during replays. In "main view" mode, use the Left Analog-stick to move it up, down, left, or right; and L and R to zoom in and out.
To get the nitrous from the used parts shop, you will have to lose at the drag races on a day ending with "5". For example, 305,15, etc. Return to the screen for the parts shop after the drag race. It will now be 306,16,etc. There will be a question mark at the end of all the parts, after the turbos. If your car has a turbo or if it does not appear, get out then go back in and it should appear. Note: You must have a bolt on turbo to get Nitrous Oxide.
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.
Enter your fastest car into the "oval track". Try not to hit anything and you will get a "Perfect" and extra money.
Enter the fastest drag racing car you have into the drag race. Win the drag race at least ten times.
Enter the used parts menu, select a part and check the price. Exit the screen and repeat a few times. The price may drop down by a couple hundred dollars.
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.
When you are starting a race, if you want to get ahead of everyone quicker, cut as many cars off as possible. As soon as you get in front of a car, it will slow down quickly, allowing you to get further ahead faster.
Press the gas in the drag race just as "1" appears on your screen to get a slightly quicker start.
Faster drag race:
During a drag race turn your TCS (Traction Control System) off at the options menu. You will notice your car is much slower with it on. Just let the wheels spin and you will get a win every time. Note: This trick works with all cars, but a faster car such as a charger is recommended to get wins constantly.