Traditionally anything you do to a car to upgrade the power from factory levels will void your warranty. That won’t stop most automotive enthusiasts, but it does stop a few folks from modifying their cars. If you own a Ford Focus ST,Ford has a new performance upgrade kit that will give you some more power to play with and allows you to keep your factory warranty intact.

The performance upgrade kit for the 2015 Focus ST ups power output to 275hp and 296 lb-ft of torque.
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https://www.slashgear.com/ford-focus-st-performance-upgrade-kit-makes-275hp-18398013/