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Those look like turn down exhaust tips for a car or truck. You can find them at most auto stores and on ebay or Amazon. Back in the day I used similar on some of the exhausts I made, but since my bike has chrome I usually used stainless tips. You just need to match the inlet size and length.

Welcome to the forum too. Just a note, this part of the forum is for describing how to do things, not asking questions on them.

 

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When I was a kid I had a Honda 350 Scrambler that had the washer thingy built into the pipes. No mufflers, or I don't remember it having any, just the washer that you could turn to quieten it down in town. It came from the factory that way. The pipes wrapped around the engine and came up high on the left side of the bike.

 

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Two of my friends with the Harley Twin-Cams (Street Bob and a Wide Glide) would bend the flanges on the 'inside' of their THUNDERHEADERS inward to restrict the flow. They said it improved their 'midrange' and would tone down the sound a weeeee bit. The exup valve on the Yamaha Raider will increase and decrease the back pressure. I believe their is a similar valve (can't think of its name) that works the same on the M109...PEACE RIDE SAFE

The 109 calls theirs the SET valve, for Suzuki Exhaust tuning. Same thing as the EXUP valve on the Yamaha.

I don't know if they still sell them or not, but they used to have a thing called "Torque Cones" that accomplished what your friends did to their headers. It was shaped like a short funnel and dropped into the top of the head pipe where it bolts to the cylinder heads.

 

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AR cones , anti reversion cones.

Thanks Joe, that was the name I was looking for.

 

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I've following this thread with some interest, and I remember years ago seeing a picture where someone had cut open the original mufflers to show the layout of the standard baffles although after several Internet searches I cannot locate it, anyone remember this at all.

I remember that, but it wasn't a picture, it was an illustration of the two types of stock muffler construction that these have had. I looked for it and couldn't find it, but I did run across an interesting How-To on here on shortening the stock pipes. I looked through it thinking it might show something, but no luck.