[Hotfingrs]

There is nothing in the pipe, but the baffle. If you look at the picture in the first post, you can see a tab on the right end. There is also one on the other end. You would drill 2 holes on the backside of the pipe to corresponde with these tabs. The tab has a nut on it, so a small allen head bolt holds the baffle in place. The baffles can also be made to any length and are generally 3 1/2 diameter, but can also be made to any diameter.