I am thinking about putting an after market slip on muffler on my o6 400 auto. Would it be worth the exrta $250 or is it a waste of time and money? Is there a noticeable increase in power? Next bike will be at least an 500 ac. Has anyone heard about the icat? Go to www.icatusa.com. Quad magazine says it does everything it claims. $200 price tag . Any feedback would be appreciated.