This may be a repost but i tried the search and i could not find a thread on hold to install new turn signals on my sc400 . Do i have to take out the airbox or is there an easier way?

 

I believe you can do it without removing anything (I changed mine). It's a tight squeeze, though, just try to unhook the harness with some pliers or something. I accidentally broke a minor plastic piece off the harness on the left side because I was using a flathead screwdriver. Those things are a real pain to unhook because of the limited room.