What causes a weird flapping noise coming out of one pipe on dual glass pack exhaust?
A weird flapping noise coming out of one pipe on a dual glass pack exhaust is likely caused by a loose baffle inside the glass pack. Baffles are metal plates or tubes that are placed inside the exhaust pipe to help reduce noise. Over time, the baffles can become loose and start to rattle around inside the exhaust, which can create a flapping noise. To fix the noise, you will need to remove the glass pack and either tighten or replace the loose baffle.