Ford Fiesta Modifications, but car under insurance and warranty

Good day

I would like to know what my options are when it comes to gaining maybe 20kW more on my Ford Fiesta 1.4 without losing my warranty and the other benefits that comes with when owning a new car?

There is not much for North American market Fiesta beyond a low restriction exhaust and a smooth induction tube and oiled air filter element.
The careful selection of a lighter wheel and tire setup helps free up available power for better acceleration. Cleaning accumulated junk from the interior is also a free upgrade.