It is typically recommended that you start at a softer setting and go for a ride and then adjust accordingly. If you want to avoid the alignment then make sure you do the installation at stock height. If you lift the car up (think on a lift with the wheels hanging down) and then put them on it is possible the alignment could be effected. And if you remove any other suspension components then you definitely should do an alignment. But as suggested, it is good to get a custom alignment regardless because the car will handle better (even without a sway bar installation).