this problem arose on my sti after 200miles. i was dumbfounded until i was able to get to a computer and do a search. Once i understood the culprit was a tight wire, it was an easy fix. Unlike most folks i did not move the entire airbox. All i did was loosen the front nut to the airbox. My hands were small enough to squeeze through to unplug the turn signal. I gave it a few tugs to get some slack. BOOM no more turn signal problems 1000miles later.