Ive had it on for about 4 months now. The tone deepened just alittle and its holding up well. Couldnt be happier.. bUtT,, Im noticing quite alot of black carbon inside the tailpipes. Kinda seems more than normal. I dont put many miles a day on it. I guess I need to get it out and open it up more. Not sure if the muffler has changed the back pressure that much to cause more carbon buildup or possibly the motor needs serviced. I never really noticed the build-up on the stock system , but the tailpipe angled down on it. Anyone else seeing alot of carbon buildup ?? Maybe its that damm corn gas Im burning
