Please note that induction kits will only add power if you have a restriction in your air intake. If you haven't tuned it much then the standard airbox is generally fine and up to the job.
We just like cars need air. In an engine the air needs to be matched precisely to the fuel used into what is referred to as an air to fuel ratio or AFR.
For petrol engine cruising at low load an AFR of around 14.5:1 is the ideal, but under load the engine will require more fuel, with typically around a 13:1 AFR. In a turbo engine the AFR might be much higher at around 11 – 11.6:1.
Generally speaking the more air you have the greater the amount of fuel but some air filters can be quite restrictive so we look at the options of upgraded cold air intake. Most engines will automatically trim the fuel to match the air depending on how many unburnt particles there are in the exhaust.