At approximately 1520 Mountain time, the tailwheel-equipped airplane collided with a runway sign during the landing roll. The Private pilot, who was the sole occupant of the aircraft, was not injured, but the aircraft sustained substantial damage. According to the pilot, who landed on Runway 25, he was cleared by the tower to turn off the runway at Taxiway Echo. While attempting to make the right-hand turn onto the taxiway, the pilot inadvertently turned too soon, and the aircraft collided with the runway identification sign near the intersection of the runway and the taxiway. The force of the impact resulted in the right main gear leg attachment box being bent and distorted. According to the pilot, there was nothing wrong with the aircrafts directional control system or brakes.