Hi Shams,
Yes, adding a turbo will definitely affect your warranty, but that is the least of your problems.
Adding a turbo to any non-turbo engine has many problems, since the ECU is not programmed to handle the additional signals required to make the turbo work properly. For one thing, the ECU on your standard engine does not have a circuit to control the turbo boost. You can of course change the ECU, but remember that the new ECU may not be able to handle the signals from the sensors on a non-turbo engine effectively.
There are lots of other differences to keep in mind. For instance, the standard ECU is programmed to manage an engine without boost, meaning that basic baseline settings such as ignition mapping, fuel delivery, air flow (both inlet and exhaust) and others need to change to accomodate the turbo.
However, anything is possible, but to get the car running right might cost you more than you would have paid for a turbo model, so I would not advise you to try this. You might find that the car never runs right, no matter how much money you spend on it.