What is the best way to improve the engine performance of a Ford Focus?

I recently purchased a Ford Focus and I am looking for ways to enhance its engine performance. I would like to know what modifications I can make to upgrade my car's performance.

Firstly, you can start by upgrading your air intake system and installing a cold air intake. This will allow more air to flow into the engine and increase its horsepower. Additionally, you can also consider installing a performance exhaust system.

Another way to improve your engine's performance is by adding a performance chip or programmer. This will optimize your car's computer to deliver more power and torque. You can also consider upgrading your car's spark plugs and ignition system for better fuel delivery and combustion.

Don't forget to regularly maintain your car and change the oil on time. This will ensure your engine runs smoothly and efficiently. You can also consider getting a professional tune-up to further boost your car's performance.