- 1). Start the game and click on the "Tuner Mode" option from the main menu. Enter a name into the "Account Name" field and then choose the level of difficulty you want to play.
- 2). Click on the "Dealer" option and you'll be brought to the "Dealer" screen. Find a car that you want to race in.
- 3). Choose the "Store" option and then click on "Parts." Select "Parts Source" and then click on "Performance Parts."
- 4). Choose the "Nitrous" option and then click on "Nitrous Kit." Select the kit you want and you'll then have a nitrous kit installed in your car.
- 5). Click on the "Nitrous Refill" icon from the bottom right-hand side of the screen to get a nitrous refill. You can now use your nitrous in a race by pressing the "N" key on your keyboard.
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