if you do want nos in the car make sure it is build up with the best stuff as possible and make sure you have the biggest fuel injectors because without enough fuel to burn and break down the nos into nitrogen and oxygen you can cause major damage to the motor. i would not advise it because of my friends sti because he naded his motor. stick to getting and good motor try to bore it out if possible and lighten the car cuz thats the only way to beat a mustang weight-power ratio try and get super car light.