My cousin did a mod that made his GW sound much better with no droning effect to mount to anything. He came up today to show me how easy it is, and boy is it easy.
stock muffler before cutting with end cap off
After cutting
What was cut off
you want to cut it at the round seam leaving the 3 threaded mounting threads so you can reinstall the end cap.
Sound is subjective. It has a much deeper sound with around 5% more volume, guessing here. I have no droning effect at all. At speed it is slightly louder, you can really hear th enew sound at low speeds. Performance, too early to say but I don't feel ,uch of a change if any at all.
It is just about perfect for me. Just enough sound to make it sound good. No interference with the sound of my tunes.
Took around 40 minutes to do total. On a trike the mufflers come off really easy and makes the cutting very easy using a port=a-band saw.