Best modifications for a Ford Focus ST

I recently purchased a Ford Focus ST and I am looking for some modifications to increase its performance. I'm not looking for anything too crazy, just some upgrades that will give me a noticeable difference. What modifications would you recommend?

I would recommend upgrading the air intake with a high-flow cone filter and an aftermarket exhaust system. These simple modifications can greatly improve the engine's performance and sound. Additionally, consider getting a tune to optimize the engine's power output.

Another great upgrade would be to install a performance chip. It can provide a significant increase in horsepower and torque. Also, don't forget to upgrade the brakes to handle the extra power.

For a noticeable difference in handling, I would recommend upgrading the suspension with coilovers or lowering springs. This will improve the car's handling and give it a more aggressive look.