I'm looking for an aftermarket muffler that's quieter than stock. Does such a thing exist?
The problem is, you can't get into the cavity. When pulling the spark arrester, there's no more space vacated other than the spark arrester. If the entire end came off the muffler, that would be one thing, but it doesn't. Just a center small diameter section comes out. Here's a couple photos;anybody ever stuff the cavity with rock wool? Result?