Hi, i just bought a 2000 honda vfr 800. After riding it for about 3 weeks it broke down on me. I took it to the shop and they said theres nothing wrong with it. Now it breaks down after driving it after 30 mins. It has an after market two brother exhaust. My guess is whoever installed the two brother exhaust did something wrong. I dont think it has O2 sensors on it. I was wondering if anyone can help me with this problem?