Most single engine exhaust systems are designed to effectively as possible remove exhaust and heat from the individual cylinders.
They are an air cooled engine, so a whole different animal than an automobile.
So, the muffler is not built to reduce noise. Doing so hinders its ability to do those first 2 things we talked about.
The sad part for an owner is, a new system for these aircraft can cost anywhere between $2,000 to $9,000 .
So none of us are laughing to hard when we have to write that check Lol