Using this cold air intake is simple. First, make sure your vehicle is turned off and cooled down. If you have a non - widebody 2017 - 2018 Dodge Challenger or Charger Hellcat, you'll need to upgrade the throttle body to 108mm for the intake to fit. Once installed, the intake will start working right away to boost your vehicle's performance. Note that this intake is not street - legal in all US states, so check your local laws before using it on public roads. For maintenance, regularly check the amount of oil (it should be around 55 grams). Also, inspect for any dirt or debris that might have gotten past the filter. If your intake isn't performing properly or is defective, S&B will replace it under the Million Mile Warranty as long as you bought it from an authorized dealer and used it on the right vehicle under normal driving conditions.