Upgrading the intake system is an easy way to gain horsepower for any car. A restrictive intake system robs the engine of fuel efficiency and power. By increasing your engine's ability to breath maximum power can be achieved. Some performance gains can be achieved by high performance drop-in air filter replacements. The most performance gain is through complete cold air intake systems that draw air outside of the engine bay. By lowering intake charge temperature, the engine operates closer to its optimum efficiency. Short ram air intake systems offer performance gains over factory intake systems and generally install in 1-2 hours. For highly modified vehicles, performance gains can be had by adding aftermarket intake manifolds with larger plenum volumes.