How to improve the horsepower in a Ford Focus?

I have a Ford Focus SE and I want to increase its horsepower for better performance. Any tips or suggestions on how to achieve this?

One way to improve horsepower in a Ford Focus is to install a cold air intake system. This will allow for better airflow to the engine and increase horsepower.

Another option is to upgrade the exhaust system, which can help improve horsepower and performance. Look into a high-flow catalytic converter and a free-flowing exhaust system.

You can also consider tuning or remapping the engine to optimize its performance. This can result in a significant increase in horsepower, but it can be expensive and may void your warranty.