The aerodynamics of the OEM fairing are not good. There is a lot of turbulence right at helmet level. I’d try to find another FZ6 to ride with the original fairing before you drop $300-$500.
I have two FZ6’s. Both are naked. I much prefer the smooth airflow. When I first got my FZ6 I had trouble connecting with the bike…there was something about it that I didn’t like but I couldn’t quite figure it out. I was contemplating selling the bike and took it out for a ride to figure out what to do with it. During that ride I stood up to stretch my legs and I instantly realized it was the airflow from the fairing that I hated. When I got home I immediately removed the fairing. There are some cool headlight assemblies out there that would give the FZ6 a very modern look.