From what I know it is a stock bike with a Yoshimura pipe. I have installed Ecliptech dual light driver kit to run 55w headlights safely, and also an Ecliptech LED tail light kit for that modern, bright look.
Bike goes well, sounds tough and I enjoy riding it. Currently been in my hands for about 2 months.
It is my second bike, my first being a Ninja 300. I love the handling of the RVF400, which I experienced doing a natio run.
Looking forward to taking it to do my MOST.