It changes the king pin angle.

The king pin angle is the angle formed where the ground line (horizontal) and the line that passes through the ball joins on the steering knuckles meet. The Inclined KPA arms move the upper ball joints of the steering knuckles inward, toward the chassis. Because of this, installing the IKPA arms will immediately introduce positive camber (top of wheels pointing outward from chassis), and some toe out.

With the upper ball links moved inward, the geometry of the suspension is changed--the upper suspension links will be shorter. The shortened links will introduce more camber gain during suspension compression (compared to the camber gain introduced with standard/typical upper link lengths.).