The screw fix is onlt temporary. Eventually, you will have to replace the muffler. They just aren't made to last forever. The fix would be for FFR to supply the system with the Lobac "auger" style muffler. By the time you purchase, ceramic coat ( for those who do) and take the time to instal, one has a considerable amount of time and money invested only to have to replace after 6,000 mi.