Situations like this have been brought up at our instructors briefing. Do bring this up with us or see the Head Instructor. HPC has mantained incident free (touch wood) events all the while and i reckon this will continue.
Ok,found this article about how to make twin muffler/exhaust system that is consist of s-flow and straight flow at the same time.
but the problem is i dont know where to find the parts and if i can use another part...