not too noisy

DrCharles said
Out at the tail, I wouldn't think as much packing/quieting would be required?
Here's a pic of the inside of the Summit turbo.

View attachment 1715616216

If the first muffler isn't quietening the exhaust enough, a glasspack won't add much either. Do you know the length of the muffler bodies? The longer the body, the quieter it will be.