[fireant911]

I too had a very annoying noise from my B&B muffler that occurred within a certain rpm range. I loosened one of the muffler clamps and placed a strip of thermal cloth to stop these vibrations. I am NOT an advocate of B&B exhaust systems - I have since sold the complete system (heat exchangers and muffler) and replaced it with the stock exhaust and absolutely love it (as do my neighbors).