I asked mine again the other day (just as a reminder to him). Again, he said about the only thing that would cause it to not be warrantied is if you did something way out that caused it. The example he gave was cutting into the wiring and it later shorting out and causing a fire, etc. Another example was rejetting to lean and burning a hole in a piston, etc. He said most after market accessories like tires, pipe, etc are ok. I didn't ask about ruining a cv joint due to big tires or being pulled out of a mud hole with the wheels turned and popping them out.